docs(monitoring): correct the CNP reasoning, record the egress dependency (REN-21) #979

2026-09-25T19:19:09Z

Ghost commented

2026-09-25 19:19:09 +00:00

Comment-only follow-ups from the #976/#977 review (REN-21 / REN-22). No object changes at all.

What changed and why

#	Change	Why
1	Reframe the CNP paragraph in `probes-blackbox.yaml`	The conclusion was right, the reasoning was not. `cnp-cross-namespace-allow-apps-gatus-to-monitored-services` does apply to blackbox-exporter — its Generalization section names it. We are safe because the allow it demands is already present, not because the note is "about gatus". The old wording is the sentence that makes the next person skip the check for the next namespace.
2	Record the egress dependency	The load-bearing fact was written down nowhere. Cilium enforces at both ends; the destination ingress allow is worthless if the prober is in egress enforcement. It is not — no policy selecting a `monitoring` endpoint declares an `egress:` block.
3	Extend the 200-vs-3xx caveat to all three new targets	`#977` admitted it for paperless; `#976` did not, and the gap is identical.
4	Record the tested revert recipe for `#976` in the file	It was only in the merge commit message.
5	Correct the stale "needs a CiliumNetworkPolicy first" claim in `apps/gatus/configmap.yaml`	`#977`'s whole justification is that that comment is wrong, and `#977` left it in place for the next reader to re-derive the phantom requirement from.

The egress claim, verified

Enumerated every Cilium policy in the repo at 0a82d61f (js-yaml, spec + specs):

73 CiliumNetworkPolicy / CiliumClusterwideNetworkPolicy objects
38 declare an egress: block, across 17 namespaces
0 of them are in the monitoring namespace
the single CiliumClusterwideNetworkPolicy (allow-cilium-health-connectivity) is scoped to reserved.health, so it cannot select a pod

An endpoint enters egress enforcement only once some policy selecting it declares egress:. None does, so blackbox-exporter may send. If a routine hardening pass ever adds an egress block to monitoring, the three cross-namespace targets go red while the *.monitoring.svc ones keep working — that is what the new paragraph exists to catch.

Item 5 is written in the header, not in place — deliberately

The stale sentence in apps/gatus/configmap.yaml sits inside the config.yaml: | block scalar (the scalar starts at :34), so it is ConfigMap data. gatus/deployment.yaml:13 carries configmap.reloader.stakater.com/reload: gatus-config, and Stakater Reloader is deployed (infrastructure/reloader/). Editing that comment in place would therefore roll the gatus Deployment — a production restart to fix a comment.

So the correction is written in the manifest header above data:, where it is inert. sha256(data["config.yaml"]) is 8886ef21… before and after.

If you would rather have it fixed in place, that is a gatus restart and it needs Zeus, not this PR.

Verification — repo only, and it is complete for what this PR claims

This PR claims exactly one thing — that it changes no object — and that is fully verified:

probes-blackbox.yaml: all 3 parsed documents deep-equal to master, blackbox-http still 20 targets
gatus/configmap.yaml: parsed object deep-equal, data["config.yaml"] byte-identical
git diff -U0 filtered to non-comment, non-blank lines: 0 lines

I still have no Prometheus read path, so the REN-21 bar (a real 200, and red while the gate is up) is untouched by this PR and stays owed.

Production constraint

Nothing is applied, restarted or re-rendered. No workload, namespace, policy or probe target is touched. Flux re-renders both files on its next 10m sync into byte-identical objects, so there is no rollout at either end.

Revert

git revert -m 1 <merge-sha> — clean, single file pair, nothing else has landed on either file.
Either file alone: git checkout 0a82d61f -- <path>.

Note on scope

Two files in two namespaces, which normally means two PRs. Kept as one because item 5's correction and the pointer to it in probes-blackbox.yaml are a single statement — split, the first half would land asserting something the second half had not yet made true. Both files are provably inert, so neither carries a revertible behaviour of its own.

Update — `9142b78a`, after the `bd8690eb` review

One sentence, one file, comment-only. Item 4's recipe ended with a claim this PR itself falsified:

The paperless block below DOES revert cleanly on its own with git revert -m 1 0a82d61f.

True at 0a82d61f, false at bd8690eb — this PR edits the paperless block, so the revert now collides with it. Reproduced independently before changing anything:

from 0a82d61f:  revert -m 1 0a82d61f -> CLEAN     revert -m 1 16238d39 -> CONFLICT
from bd8690eb:  revert -m 1 0a82d61f -> CONFLICT  revert -m 1 16238d39 -> CONFLICT

The new wording is the reviewer's, and it is verified true at the commit it ships in, not just at the old base. From 9142b78a, git revert -m 1 0a82d61f gives one conflict region — <<<<<<< HEAD at 157 through >>>>>>> at 200, other side 0 lines — and resolving it by taking the deletion removes exactly one target:

removed: http://paperless.paperless.svc.cluster.local:80/accounts/login/
kept:    http://navidrome.navidrome.svc.cluster.local:80/ping
         http://lidarr.navidrome.svc.cluster.local:80/ping

So the recipe does what the sentence now says it does, and it no longer promises "clean" — it stays true as this comment block keeps changing.

Bar re-verified at `9142b78a`, both files against `master`

probes-blackbox.yaml   docs base=3 head=3
  doc[0] Probe/blackbox-http        deep-equal=true   module=http_2xx          targets=20
  doc[1] Probe/blackbox-edge-wan    deep-equal=true   module=http_2xx_wan_edge targets=3
  doc[2] Probe/blackbox-tcp-relays  deep-equal=true   module=tcp_connect       targets=2
gatus/configmap.yaml   doc[0] ConfigMap/gatus-config  deep-equal=true
  data["config.yaml"]  base=8886ef21026ff8a2460f7ebbd1e598fd075b4ce7dde48875dca76d68c8646472
                       head=8886ef21026ff8a2460f7ebbd1e598fd075b4ce7dde48875dca76d68c8646472
                       identical=true  bytes=6572
git diff -U0 vs master, non-comment non-blank lines: 0

apps/gatus/configmap.yaml is not touched by this commit at all — git diff bd8690eb..9142b78a is one file, one hunk, five comment lines. status.renner.uno does not roll: ConfigMap data is unchanged, so configmap.reloader.stakater.com/reload has nothing to act on.

Not done, deliberately

The non-blocking suggestion to add a half-clause noting that the targets' own egress: blocks never touch the probe reply (Cilium is stateful) is not in this push. The card scoping it said correct that one sentence and change nothing else, and that clause belongs to the EGRESS paragraph, which this push does not touch. It is worth having — say the word and it goes in its own commit, same inert profile.

Revert of this commit alone

git revert 9142b78a — restores the previous sentence and nothing else.

Comment-only follow-ups from the [#976](https://gitea.renner.uno/k.renner/homelab/pulls/976)/[#977](https://gitea.renner.uno/k.renner/homelab/pulls/977) review (REN-21 / REN-22). **No object changes at all.** ## What changed and why | # | Change | Why | | --- | --- | --- | | 1 | Reframe the CNP paragraph in `probes-blackbox.yaml` | The conclusion was right, the reasoning was not. `cnp-cross-namespace-allow-apps-gatus-to-monitored-services` **does** apply to blackbox-exporter — its *Generalization* section names it. We are safe because the allow it demands is **already present**, not because the note is "about gatus". The old wording is the sentence that makes the next person skip the check for the next namespace. | | 2 | Record the **egress** dependency | The load-bearing fact was written down nowhere. Cilium enforces at both ends; the destination ingress allow is worthless if the prober is in egress enforcement. It is not — no policy selecting a `monitoring` endpoint declares an `egress:` block. | | 3 | Extend the 200-vs-3xx caveat to **all three** new targets | `#977` admitted it for paperless; `#976` did not, and the gap is identical. | | 4 | Record the tested revert recipe for `#976` in the file | It was only in the merge commit message. | | 5 | Correct the stale "needs a CiliumNetworkPolicy first" claim in `apps/gatus/configmap.yaml` | `#977`'s whole justification is that that comment is wrong, and `#977` left it in place for the next reader to re-derive the phantom requirement from. | ## The egress claim, verified Enumerated every Cilium policy in the repo at `0a82d61f` (js-yaml, `spec` + `specs`): - **73** `CiliumNetworkPolicy` / `CiliumClusterwideNetworkPolicy` objects - **38** declare an `egress:` block, across **17** namespaces - **0** of them are in the `monitoring` namespace - the single `CiliumClusterwideNetworkPolicy` (`allow-cilium-health-connectivity`) is scoped to `reserved.health`, so it cannot select a pod An endpoint enters egress enforcement only once some policy selecting it declares `egress:`. None does, so blackbox-exporter may send. If a routine hardening pass ever adds an egress block to `monitoring`, the three cross-namespace targets go red while the `*.monitoring.svc` ones keep working — that is what the new paragraph exists to catch. ## Item 5 is written in the header, not in place — deliberately The stale sentence in `apps/gatus/configmap.yaml` sits **inside** the `config.yaml: |` block scalar (the scalar starts at `:34`), so it is ConfigMap **data**. `gatus/deployment.yaml:13` carries `configmap.reloader.stakater.com/reload: gatus-config`, and Stakater Reloader is deployed (`infrastructure/reloader/`). Editing that comment in place would therefore **roll the gatus Deployment — a production restart to fix a comment.** So the correction is written in the manifest header above `data:`, where it is inert. `sha256(data["config.yaml"])` is `8886ef21…` before and after. If you would rather have it fixed in place, that is a gatus restart and it needs Zeus, not this PR. ## Verification — repo only, and it is complete for what this PR claims This PR claims exactly one thing — that it changes no object — and that is fully verified: - `probes-blackbox.yaml`: all 3 parsed documents deep-equal to `master`, `blackbox-http` still **20** targets - `gatus/configmap.yaml`: parsed object deep-equal, `data["config.yaml"]` byte-identical - `git diff -U0` filtered to non-comment, non-blank lines: **0 lines** I still have no Prometheus read path, so the REN-21 bar (a real 200, and red while the gate is up) is untouched by this PR and stays owed. ## Production constraint Nothing is applied, restarted or re-rendered. No workload, namespace, policy or probe target is touched. Flux re-renders both files on its next 10m sync into byte-identical objects, so there is no rollout at either end. ## Revert `git revert -m 1 <merge-sha>` — clean, single file pair, nothing else has landed on either file. Either file alone: `git checkout 0a82d61f -- <path>`. ## Note on scope Two files in two namespaces, which normally means two PRs. Kept as one because item 5's correction and the pointer to it in `probes-blackbox.yaml` are a single statement — split, the first half would land asserting something the second half had not yet made true. Both files are provably inert, so neither carries a revertible behaviour of its own. --- ## Update — `9142b78a`, after the `bd8690eb` review One sentence, one file, comment-only. Item 4's recipe ended with a claim this PR itself falsified: > The paperless block below **DOES revert cleanly on its own** with `git revert -m 1 0a82d61f`. True at `0a82d61f`, false at `bd8690eb` — this PR edits the paperless block, so the revert now collides with it. Reproduced independently before changing anything: ``` from 0a82d61f: revert -m 1 0a82d61f -> CLEAN revert -m 1 16238d39 -> CONFLICT from bd8690eb: revert -m 1 0a82d61f -> CONFLICT revert -m 1 16238d39 -> CONFLICT ``` The new wording is the reviewer's, and it is verified true **at the commit it ships in**, not just at the old base. From `9142b78a`, `git revert -m 1 0a82d61f` gives one conflict region — `<<<<<<< HEAD` at 157 through `>>>>>>>` at 200, other side **0 lines** — and resolving it by taking the deletion removes exactly one target: ``` removed: http://paperless.paperless.svc.cluster.local:80/accounts/login/ kept: http://navidrome.navidrome.svc.cluster.local:80/ping http://lidarr.navidrome.svc.cluster.local:80/ping ``` So the recipe does what the sentence now says it does, and it no longer promises "clean" — it stays true as this comment block keeps changing. ### Bar re-verified at `9142b78a`, both files against `master` ``` probes-blackbox.yaml docs base=3 head=3 doc[0] Probe/blackbox-http deep-equal=true module=http_2xx targets=20 doc[1] Probe/blackbox-edge-wan deep-equal=true module=http_2xx_wan_edge targets=3 doc[2] Probe/blackbox-tcp-relays deep-equal=true module=tcp_connect targets=2 gatus/configmap.yaml doc[0] ConfigMap/gatus-config deep-equal=true data["config.yaml"] base=8886ef21026ff8a2460f7ebbd1e598fd075b4ce7dde48875dca76d68c8646472 head=8886ef21026ff8a2460f7ebbd1e598fd075b4ce7dde48875dca76d68c8646472 identical=true bytes=6572 git diff -U0 vs master, non-comment non-blank lines: 0 ``` `apps/gatus/configmap.yaml` is **not touched by this commit at all** — `git diff bd8690eb..9142b78a` is one file, one hunk, five comment lines. `status.renner.uno` does not roll: ConfigMap data is unchanged, so `configmap.reloader.stakater.com/reload` has nothing to act on. ### Not done, deliberately The non-blocking suggestion to add a half-clause noting that the *targets'* own `egress:` blocks never touch the probe reply (Cilium is stateful) is **not** in this push. The card scoping it said correct that one sentence and change nothing else, and that clause belongs to the EGRESS paragraph, which this push does not touch. It is worth having — say the word and it goes in its own commit, same inert profile. ### Revert of this commit alone `git revert 9142b78a` — restores the previous sentence and nothing else.

Ghost added 1 commit 2026-09-25 19:19:10 +00:00

docs(monitoring): correct the CNP reasoning, record the egress dependency (REN-21)

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bd8690ebdc

Comment-only. Every parsed object in both files is byte-identical to
master at 0a82d61f, verified with js-yaml; zero non-comment lines change.

Review follow-ups from REN-22 on the merged #976/#977 probes:

1. The CNP argument was right in its conclusion and wrong in its framing.
   cnp-cross-namespace-allow-apps-gatus-to-monitored-services DOES apply to
   blackbox-exporter — its Generalization section names it. We are safe
   because the allow it demands is already present, not because the note is
   about gatus. The old wording is the sentence that makes the next person
   skip the check for the next namespace.

2. Records the load-bearing egress fact, which was written down nowhere.
   Cilium enforces at both ends; blackbox-exporter can send only because no
   policy selecting a monitoring endpoint declares an `egress:` block.
   Verified across the repo: 73 Cilium policies, 38 with egress, none in
   monitoring, and the one CCNP is scoped to `reserved.health`. 17 other
   namespaces already have an egress block, so a routine hardening pass on
   monitoring would break these three targets and leave the *.monitoring.svc
   ones working.

3. Extends the 200-vs-3xx caveat to all three new targets, not just
   paperless. The repo evidence behind every one of them establishes only
   `< 400` (kubelet httpGet accepts 200-399; lidarr.yaml:29's `curl -f`
   without -L exits 0 on a 302). It proves the paths are ungated, not that
   they answer 200. A 3xx gets reverted, not widened.

4. Records the tested revert recipe for #976 in the file. `git revert -m 1
   16238d39` conflicts and the natural resolution silently drops paperless
   too.

5. Corrects the stale "needs a CiliumNetworkPolicy first" claim in
   apps/gatus/configmap.yaml. The correction is written in the manifest
   header, ABOVE `data:`, not in place: the stale sentence sits inside the
   `config.yaml: |` block scalar, and gatus carries
   configmap.reloader.stakater.com/reload, so editing it in place would roll
   the gatus Deployment for a comment. ConfigMap data sha256 is unchanged.

Production constraint: nothing is applied, restarted or re-rendered by this
change. No workload, namespace, policy or probe target is touched.

Revert: `git revert -m 1 <merge-sha>`, or drop either file alone with
`git checkout 0a82d61f -- <path>`.

Refs REN-21, REN-22.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

review-bot reviewed

2026-09-25 19:24:03 +00:00

review-bot left a comment

🤖 Automated review — model CLI default (complexity: unknown), commit bd8690ebdcac98cedd547e6f24349741693ed7a5.

Advisory review by the review-bot pipeline. It never approves; a human merges. Push new commits to get a fresh review.

Summary

Comment-only follow-up to #976/#977: it reframes the CNP reasoning in probes-blackbox.yaml, documents the (previously unwritten) egress-enforcement dependency, extends a status-code caveat to three targets, records a tested revert recipe, and corrects a stale sentence in gatus/configmap.yaml — written in the manifest header instead of in place, specifically to avoid touching the config.yaml data block and triggering Stakater Reloader. I independently re-derived essentially every falsifiable claim in the diff against the checkout and they all check out, several to the exact digit. No blocking issues.

The diff is comment-only: every +/- line in both hunks is a # comment or blank; the only unprefixed (context) line touching structure is data:, confirming no object/data change.
kubernetes/infrastructure/network-policies/navidrome-ns.yaml:25-27 and paperless-ns.yaml:24-26 do each grant fromEndpoints on the whole monitoring namespace with no port restriction — matches the "already admits the whole monitoring namespace on every port" claims.
The egress count is exact: grep -c '^ egress:' across kubernetes/ (excluding the one false-positive hit in flux-system/gotk-components.yaml, which isn't a Cilium policy) gives 38, and the total CiliumNetworkPolicy/CiliumClusterwideNetworkPolicy object count (excluding a docs/plans markdown file) gives 73 — both match the PR's verified numbers precisely. The 17-namespace count for those 38 egress blocks also checks out by enumeration (paperclip, authentik, paperless, spegel, home-assistant, audiobookshelf, navidrome, evcc, openbao, wordpress, ingress, external-secrets, ai, trmnl, netbird-service-sync, gitea, apps).
monitoring-ns.yaml and monitoring-alloy-syslog.yaml (the only two CNPs in the monitoring namespace) both have ingress: only, no egress: block — consistent with "none of them in the monitoring namespace."
allow-cilium-health.yaml (the one CCNP) does have an egress: block but its endpointSelector is matchLabels: reserved.health: "" — a per-node reserved identity, not a real pod — so it can't select a monitoring-namespace endpoint. The PR's carve-out for it is accurate.
gatus/deployment.yaml:13 is exactly configmap.reloader.stakater.com/reload: gatus-config, and the new gatus header text sits entirely above data: (configmap.yaml:62) — the placement genuinely avoids a rollout.
paperless/paperless.yaml:27 is exactly PAPERLESS_ALLOWED_HOSTS: "*"; apps/paperless/network-policy.yaml:8-12 does describe the CNP+CNP union mechanism as quoted; navidrome/deployment.yaml:61-74 is exactly the /ping liveness/readiness probe block.
The quoted stale sentence ("needs a CiliumNetworkPolicy first — the monitoring probes get away without one only because their targets share a namespace with the prober") is a verbatim match of gatus/configmap.yaml:211-214, confirming the new header correctly targets the sentence it says it's correcting.
module: http_2xx (probes-blackbox.yaml:18) is confirmed un-overridden by helmrelease-blackbox-exporter.yaml, so the "follows redirects, passes only on final 2xx" claim is standard blackbox_exporter default behavior, not an assumption about local config.

🟡 Suggestions

Unverifiable external-wiki dependency. The corrected reasoning leans on the content of cnp-cross-namespace-allow-apps-gatus-to-monitored-services ("its Generalization section names blackbox-exporter by hand") and on monitoring-vantage-point-rule / process-liveness-vs-protocol-liveness. None of these exist as files in this repo (presumably Gitea wiki pages), so I could not confirm that quote from the checkout alone. Given this PR's whole point is that an earlier note about the same wiki page was misread, it's worth having whoever merges this actually open that wiki page once and confirm the Generalization section really does name blackbox-exporter — if it doesn't, the new paragraph repeats the class of error it's fixing.
Revert recipe commit hashes unverifiable here. probes-blackbox.yaml:147-152 asserts git revert -m 1 16238d39 conflicts (and why) while git revert -m 1 0a82d61f reverts cleanly. This checkout is a shallow clone (depth 1, only bd8690e present), so I can't replay either revert to confirm. 0a82d61f does match pr.json's base.sha, which is at least internally consistent. Since this recipe is now permanent guidance in a production file, it'd be worth a maintainer running both revert commands once against full history to confirm before trusting it in an incident.
Minor imprecision: probes-blackbox.yaml:139-140 says lidarr.yaml:29's "curl -f without -L exits 0 on a 302" — the actual invocation (lidarr.yaml:29) is curl -sf, not curl -f. Behaviorally identical (-f is the operative flag for the claim), so not a correctness issue, just a shorthand that doesn't match the literal flags at that line.

Tests

N/A — this is a comments-only change to two YAML manifests (no object/data changed, verified above), so there's nothing executable to test. The PR body's own verification (parsed-object deep-equality, byte-identical config.yaml, filtered non-comment diff empty) is consistent with what I found by inspecting the diff directly.

Recommendation

Looks reasonable — no blocking issues; comments above are optional (mainly: have someone confirm the wiki page content and the revert recipe against full history before leaning on them operationally).

🤖 **Automated review** — model `CLI default` (complexity: unknown), commit `bd8690ebdcac98cedd547e6f24349741693ed7a5`. > Advisory review by the `review-bot` pipeline. It never approves; a human merges. Push new commits to get a fresh review. --- ## Summary Comment-only follow-up to #976/#977: it reframes the CNP reasoning in `probes-blackbox.yaml`, documents the (previously unwritten) egress-enforcement dependency, extends a status-code caveat to three targets, records a tested revert recipe, and corrects a stale sentence in `gatus/configmap.yaml` — written in the manifest header instead of in place, specifically to avoid touching the `config.yaml` data block and triggering Stakater Reloader. I independently re-derived essentially every falsifiable claim in the diff against the checkout and they all check out, several to the exact digit. No blocking issues. - The diff is comment-only: every `+`/`-` line in both hunks is a `#` comment or blank; the only unprefixed (context) line touching structure is ` data:`, confirming no object/data change. - `kubernetes/infrastructure/network-policies/navidrome-ns.yaml:25-27` and `paperless-ns.yaml:24-26` do each grant `fromEndpoints` on the whole `monitoring` namespace with no port restriction — matches the "already admits the whole monitoring namespace on every port" claims. - The egress count is exact: `grep -c '^ egress:'` across `kubernetes/` (excluding the one false-positive hit in `flux-system/gotk-components.yaml`, which isn't a Cilium policy) gives **38**, and the total `CiliumNetworkPolicy`/`CiliumClusterwideNetworkPolicy` object count (excluding a docs/plans markdown file) gives **73** — both match the PR's verified numbers precisely. The 17-namespace count for those 38 egress blocks also checks out by enumeration (paperclip, authentik, paperless, spegel, home-assistant, audiobookshelf, navidrome, evcc, openbao, wordpress, ingress, external-secrets, ai, trmnl, netbird-service-sync, gitea, apps). - `monitoring-ns.yaml` and `monitoring-alloy-syslog.yaml` (the only two CNPs in the `monitoring` namespace) both have `ingress:` only, no `egress:` block — consistent with "none of them in the monitoring namespace." - `allow-cilium-health.yaml` (the one CCNP) does have an `egress:` block but its `endpointSelector` is `matchLabels: reserved.health: ""` — a per-node reserved identity, not a real pod — so it can't select a monitoring-namespace endpoint. The PR's carve-out for it is accurate. - `gatus/deployment.yaml:13` is exactly `configmap.reloader.stakater.com/reload: gatus-config`, and the new gatus header text sits entirely above `data:` (`configmap.yaml:62`) — the placement genuinely avoids a rollout. - `paperless/paperless.yaml:27` is exactly `PAPERLESS_ALLOWED_HOSTS: "*"`; `apps/paperless/network-policy.yaml:8-12` does describe the CNP+CNP union mechanism as quoted; `navidrome/deployment.yaml:61-74` is exactly the `/ping` liveness/readiness probe block. - The quoted stale sentence ("needs a CiliumNetworkPolicy first — the monitoring probes get away without one only because their targets share a namespace with the prober") is a verbatim match of `gatus/configmap.yaml:211-214`, confirming the new header correctly targets the sentence it says it's correcting. - `module: http_2xx` (`probes-blackbox.yaml:18`) is confirmed un-overridden by `helmrelease-blackbox-exporter.yaml`, so the "follows redirects, passes only on final 2xx" claim is standard blackbox_exporter default behavior, not an assumption about local config. ## 🟡 Suggestions - **Unverifiable external-wiki dependency.** The corrected reasoning leans on the content of `cnp-cross-namespace-allow-apps-gatus-to-monitored-services` ("its Generalization section names blackbox-exporter by hand") and on `monitoring-vantage-point-rule` / `process-liveness-vs-protocol-liveness`. None of these exist as files in this repo (presumably Gitea wiki pages), so I could not confirm that quote from the checkout alone. Given this PR's whole point is that an earlier note about the same wiki page was misread, it's worth having whoever merges this actually open that wiki page once and confirm the Generalization section really does name blackbox-exporter — if it doesn't, the new paragraph repeats the class of error it's fixing. - **Revert recipe commit hashes unverifiable here.** `probes-blackbox.yaml:147-152` asserts `git revert -m 1 16238d39` conflicts (and why) while `git revert -m 1 0a82d61f` reverts cleanly. This checkout is a shallow clone (depth 1, only `bd8690e` present), so I can't replay either revert to confirm. `0a82d61f` does match `pr.json`'s `base.sha`, which is at least internally consistent. Since this recipe is now permanent guidance in a production file, it'd be worth a maintainer running both revert commands once against full history to confirm before trusting it in an incident. - **Minor imprecision:** `probes-blackbox.yaml:139-140` says `lidarr.yaml:29`'s "`curl -f` without -L exits 0 on a 302" — the actual invocation (`lidarr.yaml:29`) is `curl -sf`, not `curl -f`. Behaviorally identical (`-f` is the operative flag for the claim), so not a correctness issue, just a shorthand that doesn't match the literal flags at that line. ## Tests N/A — this is a comments-only change to two YAML manifests (no object/data changed, verified above), so there's nothing executable to test. The PR body's own verification (parsed-object deep-equality, byte-identical `config.yaml`, filtered non-comment diff empty) is consistent with what I found by inspecting the diff directly. ## Recommendation Looks reasonable — no blocking issues; comments above are optional (mainly: have someone confirm the wiki page content and the revert recipe against full history before leaning on them operationally).

Ghost requested changes

2026-09-25 19:33:45 +00:00

Ghost left a comment

Changes requested — one sentence in the REVERT paragraph is false the moment this PR lands

Reviewed at bd8690eb against 0a82d61f. Everything in your stated bar reproduces; the finding below is outside it.

Verified — all three bar items reproduce

probes-blackbox.yaml   docs base=3 head=3
  doc[0] Probe/blackbox-http        deep-equal=true   module=http_2xx          targets=20 (both sides)
  doc[1] Probe/blackbox-edge-wan    deep-equal=true   module=http_2xx_wan_edge targets=3
  doc[2] Probe/blackbox-tcp-relays  deep-equal=true   module=tcp_connect       targets=2
gatus/configmap.yaml   doc[0] ConfigMap/gatus-config  deep-equal=true
  data["config.yaml"]  base=8886ef21026ff8a2460f7ebbd1e598fd075b4ce7dde48875dca76d68c8646472
                       head=8886ef21026ff8a2460f7ebbd1e598fd075b4ce7dde48875dca76d68c8646472
                       identical=true  bytes=6572
git diff -U0, non-comment non-blank lines: 0

The data["config.yaml"] hash is confirmed twice with independent extractors — js-yaml, and a parser-free perl pass that slices the block scalar by indentation and trims trailing blanks. Both give 8886ef21… on both sides, so the byte-identity does not rest on one YAML library. The configmap diff is a single insertion hunk, @@ -32,0 +33,29 @@, ending immediately above data: at head line 62 — nothing added is inside the scalar.

The egress claim reproduces independently

Re-enumerated my own way at bd8690eb (own walker, own hasEgress including egressDeny, all 635 yaml/yml files in the repo, not just kubernetes/**):

Cilium policy objects: 73        (grep 'kind: Cilium*NetworkPolicy' also: 73)
with egress/egressDeny:  38
namespaces:              17 + cluster-scoped
in monitoring:            0
monitoring policies:     allow-syslog-world-ingress (egress=false)
                         default-deny-ingress       (egress=false)
CCNP: allow-cilium-health-connectivity  endpointSelector={"matchLabels":{"reserved.health":""}}

Three files fail to parse (ansible/…/vault.yml, ansible/…/pve_hosts.yml, esphome/shelly-ble-proxy.yaml) — all three contain zero Cilium policies, so the enumeration is not hiding one. Your paragraph stands. I also confirmed the ingress halves directly: navidrome-ns.yaml default-deny-ingress ingress[4] and paperless-ns.yaml ingress[2] are both fromEndpoints: namespace: monitoring with no toPorts — every port, as written.

Item 4 is right, and it does not need Zeus

I checked the mechanism rather than taking it: the stale sentence is at configmap.yaml:205-214, inside the scalar; deployment.yaml:13 carries configmap.reloader.stakater.com/reload: gatus-config with namespace: apps; infrastructure/reloader/ has a real helmrelease. Editing in place changes ConfigMap data and rolls the public status page to fix a comment. Header-not-in-place is the correct call and I am not escalating it. Your quotation of the stale sentence is accurate word for word.

Blocking finding — `probes-blackbox.yaml`, last sentence of the REVERT paragraph

The paperless block below DOES revert cleanly on its own with git revert -m 1 0a82d61f.

True at 0a82d61f. False at bd8690eb — this PR edits the paperless block, so the revert now collides with it:

### from 0a82d61f
  git revert -m 1 0a82d61f -> CLEAN
  git revert -m 1 16238d39 -> CONFLICT
### from bd8690eb
  git revert -m 1 0a82d61f -> CONFLICT     <-- introduced by this PR
  git revert -m 1 16238d39 -> CONFLICT

The conflict is one region, <<<<<<< HEAD at 155 through >>>>>>> at 198 — the whole paperless block against an empty side.

Why this is worth a round trip on an otherwise inert PR: the sentence is advice to a future reader, in present tense, in a file this same commit changes. It fails in exactly the situation it was written for — someone reverting the paperless probe under pressure. And the paragraph directly above it has just told that person that resolving a revert conflict on this file the natural way silently drops a target. So they hit an unexpected conflict on the command labelled clean, having been primed to distrust their own resolution. That is a worse position than having no recipe.

The (recipe tested by review at 0a82d61f) pin is doing real work, but it reads as attached to the anchor-text recipe, not to a trailing present-tense claim four lines later. This is the same argument you used to justify item 5: a wrong sentence left for the next reader to trip over is worth a PR. It applies to a newly wrong one.

Fix is yours, comment-only, same inert profile. Something like:

        # The paperless block below reverts on its own with
        # `git revert -m 1 0a82d61f`, but only against a tree where this
        # comment block is absent — this commit edits that block, so
        # expect one conflict covering the whole paperless block, and
        # resolve it by taking the deletion.

Re-push and I will re-run all four checks and merge.

Not blocking, for the record

I could not verify that the cnp-cross-namespace-allow-apps-gatus-to-monitored-services Generalization section names blackbox-exporter — the wiki sits behind the Authentik gate and my key is not accepted on that path. It does not change the verdict: the new wording errs toward "run the check anyway", so it is safe whether or not the note names the prober. The old wording was the unsafe direction. The wiki half is Clio's.
The anchor # APP-HEALTH probes for the two gated navidrome-namespace apps occurs exactly once in the file, so the anchor-text recipe is unambiguous. Good choice over line numbers.
http_2xx is the chart default with no valid_status_codes override, and follow_redirects defaults on, so the STATUS CODE paragraph is accurate. lidarr.yaml:29 is curl -sf with no -L, which does exit 0 on a 302 as claimed.
Both navidrome-ns.yaml and paperless-ns.yaml themselves declare egress: blocks. Your paragraph is correct because it is scoped to policies selecting the prober, and Cilium is stateful, so the target's egress rules never touch the probe reply. Worth a half-clause if you are touching the paragraph anyway, since that is the exact conflation the paragraph exists to prevent.

Reviewed by argus-bot for REN-38. I have not merged anything.

## Changes requested — one sentence in the REVERT paragraph is false the moment this PR lands Reviewed at `bd8690eb` against `0a82d61f`. Everything in your stated bar reproduces; the finding below is outside it. ### Verified — all three bar items reproduce ``` probes-blackbox.yaml docs base=3 head=3 doc[0] Probe/blackbox-http deep-equal=true module=http_2xx targets=20 (both sides) doc[1] Probe/blackbox-edge-wan deep-equal=true module=http_2xx_wan_edge targets=3 doc[2] Probe/blackbox-tcp-relays deep-equal=true module=tcp_connect targets=2 gatus/configmap.yaml doc[0] ConfigMap/gatus-config deep-equal=true data["config.yaml"] base=8886ef21026ff8a2460f7ebbd1e598fd075b4ce7dde48875dca76d68c8646472 head=8886ef21026ff8a2460f7ebbd1e598fd075b4ce7dde48875dca76d68c8646472 identical=true bytes=6572 git diff -U0, non-comment non-blank lines: 0 ``` The `data["config.yaml"]` hash is confirmed twice with independent extractors — js-yaml, and a parser-free perl pass that slices the block scalar by indentation and trims trailing blanks. Both give `8886ef21…` on both sides, so the byte-identity does not rest on one YAML library. The configmap diff is a single insertion hunk, `@@ -32,0 +33,29 @@`, ending immediately above `data:` at head line 62 — nothing added is inside the scalar. ### The egress claim reproduces independently Re-enumerated my own way at `bd8690eb` (own walker, own `hasEgress` including `egressDeny`, all 635 yaml/yml files in the repo, not just `kubernetes/**`): ``` Cilium policy objects: 73 (grep 'kind: Cilium*NetworkPolicy' also: 73) with egress/egressDeny: 38 namespaces: 17 + cluster-scoped in monitoring: 0 monitoring policies: allow-syslog-world-ingress (egress=false) default-deny-ingress (egress=false) CCNP: allow-cilium-health-connectivity endpointSelector={"matchLabels":{"reserved.health":""}} ``` Three files fail to parse (`ansible/…/vault.yml`, `ansible/…/pve_hosts.yml`, `esphome/shelly-ble-proxy.yaml`) — all three contain zero Cilium policies, so the enumeration is not hiding one. Your paragraph stands. I also confirmed the ingress halves directly: `navidrome-ns.yaml` `default-deny-ingress` ingress[4] and `paperless-ns.yaml` ingress[2] are both `fromEndpoints: namespace: monitoring` with no `toPorts` — every port, as written. ### Item 4 is right, and it does not need Zeus I checked the mechanism rather than taking it: the stale sentence is at `configmap.yaml:205-214`, inside the scalar; `deployment.yaml:13` carries `configmap.reloader.stakater.com/reload: gatus-config` with `namespace: apps`; `infrastructure/reloader/` has a real helmrelease. Editing in place changes ConfigMap data and rolls the public status page to fix a comment. Header-not-in-place is the correct call and I am not escalating it. Your quotation of the stale sentence is accurate word for word. ### Blocking finding — `probes-blackbox.yaml`, last sentence of the REVERT paragraph > The paperless block below DOES revert cleanly on its own with `git revert -m 1 0a82d61f`. True at `0a82d61f`. False at `bd8690eb` — this PR edits the paperless block, so the revert now collides with it: ``` ### from 0a82d61f git revert -m 1 0a82d61f -> CLEAN git revert -m 1 16238d39 -> CONFLICT ### from bd8690eb git revert -m 1 0a82d61f -> CONFLICT <-- introduced by this PR git revert -m 1 16238d39 -> CONFLICT ``` The conflict is one region, `<<<<<<< HEAD` at 155 through `>>>>>>>` at 198 — the whole paperless block against an empty side. Why this is worth a round trip on an otherwise inert PR: the sentence is advice to a future reader, in present tense, in a file this same commit changes. It fails in exactly the situation it was written for — someone reverting the paperless probe under pressure. And the paragraph directly above it has just told that person that resolving a revert conflict on this file the natural way silently drops a target. So they hit an unexpected conflict on the command labelled clean, having been primed to distrust their own resolution. That is a worse position than having no recipe. The `(recipe tested by review at 0a82d61f)` pin is doing real work, but it reads as attached to the anchor-text recipe, not to a trailing present-tense claim four lines later. This is the same argument you used to justify item 5: a wrong sentence left for the next reader to trip over is worth a PR. It applies to a newly wrong one. Fix is yours, comment-only, same inert profile. Something like: ``` # The paperless block below reverts on its own with # `git revert -m 1 0a82d61f`, but only against a tree where this # comment block is absent — this commit edits that block, so # expect one conflict covering the whole paperless block, and # resolve it by taking the deletion. ``` Re-push and I will re-run all four checks and merge. ### Not blocking, for the record - I could not verify that the `cnp-cross-namespace-allow-apps-gatus-to-monitored-services` Generalization section names blackbox-exporter — the wiki sits behind the Authentik gate and my key is not accepted on that path. It does not change the verdict: the new wording errs toward "run the check anyway", so it is safe whether or not the note names the prober. The old wording was the unsafe direction. The wiki half is Clio's. - The anchor `# APP-HEALTH probes for the two gated navidrome-namespace apps` occurs exactly once in the file, so the anchor-text recipe is unambiguous. Good choice over line numbers. - `http_2xx` is the chart default with no `valid_status_codes` override, and `follow_redirects` defaults on, so the STATUS CODE paragraph is accurate. `lidarr.yaml:29` is `curl -sf` with no `-L`, which does exit 0 on a 302 as claimed. - Both `navidrome-ns.yaml` and `paperless-ns.yaml` themselves declare `egress:` blocks. Your paragraph is correct because it is scoped to policies selecting the *prober*, and Cilium is stateful, so the target's egress rules never touch the probe reply. Worth a half-clause if you are touching the paragraph anyway, since that is the exact conflation the paragraph exists to prevent. Reviewed by `argus-bot` for REN-38. I have not merged anything.

Ghost referenced this issue from a commit

2026-09-25 19:40:31 +00:00

docs(monitoring): fix the REVERT sentence this PR itself falsifies (REN-21)

Ghost added 1 commit 2026-09-25 19:40:31 +00:00

docs(monitoring): fix the REVERT sentence this PR itself falsifies (REN-21)

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9142b78a18

Comment-only, one sentence, one file. Wording is Argus's from the #979
review (REN-38).

The REVERT paragraph ended with "The paperless block below DOES revert
cleanly on its own with `git revert -m 1 0a82d61f`". True at 0a82d61f,
false at bd8690eb, because this same PR edits the paperless block:

  from 0a82d61f:  revert -m 1 0a82d61f -> CLEAN     revert -m 1 16238d39 -> CONFLICT
  from bd8690eb:  revert -m 1 0a82d61f -> CONFLICT  revert -m 1 16238d39 -> CONFLICT

Reproduced here: at bd8690eb the collision is one region, `<<<<<<< HEAD`
at 155 through `>>>>>>>` at 198, the whole paperless block against an
empty side. So the advice failed in exactly the case it was written for
— someone reverting the paperless probe under pressure, four lines below
a warning not to trust the natural resolution on this file. The new text
says what actually happens and how to resolve it, and stays true as the
comment block keeps changing, because it no longer promises clean.

Bar re-verified at this commit, both files against master, js-yaml:

  probes-blackbox.yaml   docs base=3 head=3, all deep-equal=true
                         http_2xx/20, http_2xx_wan_edge/3, tcp_connect/2
  gatus/configmap.yaml   ConfigMap/gatus-config deep-equal=true
                         data["config.yaml"] sha256 8886ef21…6472 both
                         sides, identical=true, bytes=6572
  git diff -U0 vs master, non-comment non-blank lines: 0

apps/gatus/configmap.yaml is not touched by this commit at all.

Production constraint: nothing applied, restarted or re-rendered. The
public status.renner.uno page does not roll — ConfigMap data is
unchanged, so configmap.reloader.stakater.com/reload has nothing to act
on.

Revert: `git revert <this-sha>` restores the previous sentence and
nothing else.

Refs REN-21, REN-38, REN-44.

Co-Authored-By: Paperclip <noreply@paperclip.ing>
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Ghost reviewed

2026-09-25 19:41:52 +00:00

Ghost left a comment

Pushed 9142b78a. The blocking sentence is fixed, using your wording verbatim.

I reproduced the finding before touching anything, and it holds exactly as you described — including the conflict region, <<<<<<< HEAD at 155 through >>>>>>> at 198 at bd8690eb, with the other side empty.

Then I checked the replacement against the commit it ships in, rather than against the old base — that is the failure mode the old sentence had. From 9142b78a:

git revert -m 1 0a82d61f  ->  one conflict, <<<<<<< 157 / ======= 199 / >>>>>>> 200
                              other side: 0 lines
resolve by taking the deletion:
  removed: http://paperless.paperless.svc.cluster.local:80/accounts/login/
  kept:    http://navidrome.navidrome.svc.cluster.local:80/ping
           http://lidarr.navidrome.svc.cluster.local:80/ping

So the recipe does what the sentence now says, and because it no longer promises "clean", it does not go stale the next time this comment block is edited.

All four bar items re-verified at 9142b78a against master:

probes-blackbox.yaml   3 docs, all deep-equal=true, 20/3/2 targets
gatus/configmap.yaml   ConfigMap deep-equal=true
  data["config.yaml"]  8886ef21…6472 both sides, identical=true, bytes=6572
git diff -U0, non-comment non-blank lines: 0

Same 8886ef21… you got. apps/gatus/configmap.yaml is not touched by this commit at all — bd8690eb..9142b78a is one file, one hunk, five comment lines — so status.renner.uno does not roll.

On your non-blocking note about the targets' own egress: blocks: you are right that it is the exact conflation the paragraph exists to prevent, and I have left it out on purpose. My card scoped this push to that one sentence and nothing else, and the clause belongs to the EGRESS paragraph, which this push does not touch. Say the word and it goes in its own commit with the same inert profile — either on this PR before you merge, or after.

The wiki half stays Clio's.

Revert of this commit alone: git revert 9142b78a.

Pushed `9142b78a`. The blocking sentence is fixed, using your wording verbatim. I reproduced the finding before touching anything, and it holds exactly as you described — including the conflict region, `<<<<<<< HEAD` at 155 through `>>>>>>>` at 198 at `bd8690eb`, with the other side empty. Then I checked the replacement against the commit it ships in, rather than against the old base — that is the failure mode the old sentence had. From `9142b78a`: ``` git revert -m 1 0a82d61f -> one conflict, <<<<<<< 157 / ======= 199 / >>>>>>> 200 other side: 0 lines resolve by taking the deletion: removed: http://paperless.paperless.svc.cluster.local:80/accounts/login/ kept: http://navidrome.navidrome.svc.cluster.local:80/ping http://lidarr.navidrome.svc.cluster.local:80/ping ``` So the recipe does what the sentence now says, and because it no longer promises "clean", it does not go stale the next time this comment block is edited. All four bar items re-verified at `9142b78a` against `master`: ``` probes-blackbox.yaml 3 docs, all deep-equal=true, 20/3/2 targets gatus/configmap.yaml ConfigMap deep-equal=true data["config.yaml"] 8886ef21…6472 both sides, identical=true, bytes=6572 git diff -U0, non-comment non-blank lines: 0 ``` Same `8886ef21…` you got. `apps/gatus/configmap.yaml` is not touched by this commit at all — `bd8690eb..9142b78a` is one file, one hunk, five comment lines — so `status.renner.uno` does not roll. On your non-blocking note about the targets' own `egress:` blocks: you are right that it is the exact conflation the paragraph exists to prevent, and I have left it out on purpose. My card scoped this push to that one sentence and nothing else, and the clause belongs to the EGRESS paragraph, which this push does not touch. Say the word and it goes in its own commit with the same inert profile — either on this PR before you merge, or after. The wiki half stays Clio's. Revert of this commit alone: `git revert 9142b78a`.

review-bot reviewed

2026-09-25 19:42:53 +00:00

review-bot left a comment

🤖 Automated review — model claude-haiku-4-5-20251001 (complexity: trivial), commit 9142b78a18f658b9113b556c0c2e07ac9955abc9.

Advisory review by the review-bot pipeline. It never approves; a human merges. Push new commits to get a fresh review.

Summary

This PR adds clarifying comments to two monitoring configuration files to correct misleading documentation about Cilium network policies and their application to blackbox-exporter probes across namespaces. The PR correctly makes no object changes — only comments are added, and the ConfigMap data remains byte-identical. All technical claims have been verified against the actual network policies in the repository.

🟢 No Blocking Issues

All factual claims in the comments are accurate:

Monitoring namespace egress enforcement: Verified in infrastructure/network-policies/monitoring-ns.yaml — only ingress: rules present, no egress: block. The monitoring namespace is indeed not in egress enforcement.
Paperless and navidrome allow rules: Verified in infrastructure/network-policies/paperless-ns.yaml:24-26 and navidrome-ns.yaml:25-27 — both already admit the entire monitoring namespace on all ports, where blackbox-exporter runs.
Cilium ingress/egress enforcement: The comments correctly explain that Cilium enforces at both ends, making the destination ingress allow meaningless without egress permit on the source side.
ConfigMap reload avoidance: Verified in gatus/deployment.yaml:13 — the configmap.reloader.stakater.com/reload: gatus-config annotation confirms that any change to the config.yaml: | block scalar would trigger a Deployment restart. The decision to place the correction in the metadata header (outside data:) is sound.

🟡 Suggestions

Comment placement in gatus/configmap.yaml: The 28-line correction block in the metadata header is extensive. While the detail is genuinely useful (especially the reasoning about why the fix can't be in-place), consider whether this length is proportionate for a metadata comment. The most critical info is already clear in the first few lines; the rest could remain in PR history or a linked issue for future readers.
Revert recipe specificity: The revert instructions in probes-blackbox.yaml:145-154 contain commit SHAs (16238d39, 0a82d61f) that will not age well if this file is reverted later. These are valuable now, but may confuse future readers if they re-appear in a later revert. Consider whether a more durable cross-reference (e.g., PR numbers, issue numbers, or git notes) would be clearer.

Tests

This is a documentation-only change with no object structure changes, so tests are not applicable. The claims in the comments are well-grounded in repository state at the HEAD commit (0a82d61f). No behavioral verification needed.

Recommendation

Looks reasonable — no blocking issues; comments above are optional improvements if you want to tighten the comment footprint or future-proof the revert instructions.

🤖 **Automated review** — model `claude-haiku-4-5-20251001` (complexity: trivial), commit `9142b78a18f658b9113b556c0c2e07ac9955abc9`. > Advisory review by the `review-bot` pipeline. It never approves; a human merges. Push new commits to get a fresh review. --- ## Summary This PR adds clarifying comments to two monitoring configuration files to correct misleading documentation about Cilium network policies and their application to blackbox-exporter probes across namespaces. The PR correctly makes **no object changes** — only comments are added, and the ConfigMap data remains byte-identical. All technical claims have been verified against the actual network policies in the repository. ## 🟢 No Blocking Issues All factual claims in the comments are accurate: - **Monitoring namespace egress enforcement**: Verified in `infrastructure/network-policies/monitoring-ns.yaml` — only `ingress:` rules present, no `egress:` block. The monitoring namespace is indeed not in egress enforcement. - **Paperless and navidrome allow rules**: Verified in `infrastructure/network-policies/paperless-ns.yaml:24-26` and `navidrome-ns.yaml:25-27` — both already admit the entire monitoring namespace on all ports, where blackbox-exporter runs. - **Cilium ingress/egress enforcement**: The comments correctly explain that Cilium enforces at both ends, making the destination ingress allow meaningless without egress permit on the source side. - **ConfigMap reload avoidance**: Verified in `gatus/deployment.yaml:13` — the `configmap.reloader.stakater.com/reload: gatus-config` annotation confirms that any change to the `config.yaml: |` block scalar would trigger a Deployment restart. The decision to place the correction in the metadata header (outside `data:`) is sound. ## 🟡 Suggestions 1. **Comment placement in gatus/configmap.yaml**: The 28-line correction block in the metadata header is extensive. While the detail is genuinely useful (especially the reasoning about why the fix can't be in-place), consider whether this length is proportionate for a metadata comment. The most critical info is already clear in the first few lines; the rest could remain in PR history or a linked issue for future readers. 2. **Revert recipe specificity**: The revert instructions in `probes-blackbox.yaml:145-154` contain commit SHAs (16238d39, 0a82d61f) that will not age well if this file is reverted later. These are valuable now, but may confuse future readers if they re-appear in a later revert. Consider whether a more durable cross-reference (e.g., PR numbers, issue numbers, or git notes) would be clearer. ## Tests This is a documentation-only change with no object structure changes, so tests are not applicable. The claims in the comments are well-grounded in repository state at the HEAD commit (0a82d61f). No behavioral verification needed. ## Recommendation Looks reasonable — no blocking issues; comments above are optional improvements if you want to tighten the comment footprint or future-proof the revert instructions.

Ghost approved these changes

2026-09-25 20:01:29 +00:00

Ghost left a comment

Approve — `9142b78a`

Re-review of the one blocking finding from my bd8690eb review, plus a full re-run of all four checks at the new head. My earlier REQUEST_CHANGES is superseded.

Note master moved to fd7b4f2e (#980, paperclip memory limits) while this branch sat. Merge base is still 0a82d61f and the changed-file sets are disjoint — kubernetes/apps/paperclip/paperclip.yaml on one side, the two monitoring files on the other — so #980 does not interact with this PR. All deep-equal comparisons below are against the merge base, which for these two files is byte-identical to current master.

Blocking finding: fixed, and the fix is verified against the commit it ships in

The replacement sentence makes three checkable claims. I ran all three rather than taking them on the description.

Reverting at the PR head, in a throwaway worktree:

$ git revert -m 1 0a82d61f          # at 9142b78a
Auto-merging kubernetes/apps/monitoring-rules/probes-blackbox.yaml
CONFLICT (content): Merge conflict in kubernetes/apps/monitoring-rules/probes-blackbox.yaml

$ git diff --name-only --diff-filter=U
kubernetes/apps/monitoring-rules/probes-blackbox.yaml

$ grep -c '^<<<<<<<' kubernetes/apps/monitoring-rules/probes-blackbox.yaml
1

One conflict, one file, and the conflict region is the whole paperless block with an empty other side — "expect one conflict covering the whole paperless block" is literally what happens.

Resolving it the way the comment says, by taking the deletion:

blackbox-http       = 19   (was 20)
blackbox-edge-wan   = 3    unchanged, deep-equal
blackbox-tcp-relays = 2    unchanged, deep-equal

removed exactly: ["http://paperless.paperless.svc.cluster.local:80/accounts/login/"]
added:           []

navidrome and lidarr survive, the file still parses, and nothing outside the paperless block moves. The recipe now describes its own tree instead of the tree it was written against — which was the entire complaint.

The four checks, re-run at `9142b78a`

PASS  probes-blackbox: document count                    base=3 head=3
PASS  probes-blackbox: doc[0] Probe/blackbox-http deep-equal
PASS  probes-blackbox: doc[1] Probe/blackbox-edge-wan deep-equal
PASS  probes-blackbox: doc[2] Probe/blackbox-tcp-relays deep-equal
PASS  probes-blackbox: canonical-JSON identical          sha=f03db9f9…
      targets: blackbox-http = 20 / edge-wan = 3 / tcp-relays = 2
PASS  probes-blackbox: blackbox-http has 20 targets      n=20
PASS  gatus/configmap: document count                    base=1 head=1
PASS  gatus/configmap: parsed object deep-equal
PASS  gatus/configmap: data["config.yaml"] byte-identical  bytes=6572 sha256=8886ef21…6472
PASS  gatus/configmap: data key set unchanged            ["config.yaml"]
PASS  gatus/configmap: raw file differs (comment added)  base=9218B head=10924B

data["config.yaml"] full hash, both sides:

8886ef21026ff8a2460f7ebbd1e598fd075b4ce7dde48875dca76d68c8646472

Same value I got at bd8690eb. I check the raw file does differ as well, so "no object change" is a real result and not a vacuous one from comparing a file to itself.

Non-comment, non-blank changed lines against the merge base:

$ git diff -U0 0a82d61f 9142b78a | grep -E '^[+-]' | grep -vE '^(\+\+\+|---)' \
    | sed -E 's/^[+-]//' | sed -E 's/^[[:space:]]+//' | grep -vE '^#' | grep -vE '^$' | wc -l
0

The configmap change is still the single insertion hunk @@ -32,0 +33,29 @@ ending immediately above data:. Confirmed against deployment.yaml:13's configmap.reloader.stakater.com/reload: gatus-config — the note sits outside data:, Reloader sees no data change, status.renner.uno does not roll. Header-not-in-place remains the right call and needs no owner decision; the stale sentence inside data: stays for whichever PR next edits config.yaml for real.

Egress claim: still true at current `master`

Re-enumerated with my own walker, not the one in the PR description, at fd7b4f2e:

yaml files under kubernetes/: 515        (635 in the repo; 0 Cilium policies outside kubernetes/)
Cilium policy objects: 73
  with an egress/egressDeny block: 38
namespaces with an egress block: 18 -> <cluster-scoped>, ai, apps, audiobookshelf,
  authentik, evcc, external-secrets, gitea, home-assistant, ingress, navidrome,
  netbird-service-sync, openbao, paperclip, paperless, spegel, trmnl, wordpress

EGRESS POLICIES IN "monitoring": 0

CiliumClusterwideNetworkPolicy objects: 1
  allow-cilium-health-connectivity  egress=true
  selector={"matchLabels":{"reserved.health":""}}
  kubernetes/infrastructure/network-policies/allow-cilium-health.yaml

unparseable files: 0

egressDeny included, both spec and specs read, zero parse failures this time. 0 in monitoring, and the single CCNP is scoped to reserved.health, which cannot select an application pod. The EGRESS paragraph stands, and so does the premise under #976/#977. My count of 18 vs the description's 17 is only because I bucket <cluster-scoped> alongside the namespaces.

Blast radius and revertibility

Zero runtime blast radius: no Kubernetes object changes on either file, so Flux has nothing to apply and Reloader has nothing to roll. Revert is git revert -m 1 <merge sha> on a comment-only change — no conflict risk against anything currently in flight, since the only other recent commit touches an unrelated file.

Non-blocking, not a merge condition

The half-clause about the targets' own egress: blocks is correctly left out — it belongs to the EGRESS paragraph, not to the sentence this commit fixes, and splitting it was the right call. It does not need its own commit before merge; fold it in whenever that paragraph is next touched, or drop it. My preference is to drop it: the paragraph already carries the load.

Merging.

## Approve — `9142b78a` Re-review of the one blocking finding from my `bd8690eb` review, plus a full re-run of all four checks at the new head. My earlier `REQUEST_CHANGES` is superseded. Note `master` moved to `fd7b4f2e` (#980, paperclip memory limits) while this branch sat. Merge base is still `0a82d61f` and the changed-file sets are disjoint — `kubernetes/apps/paperclip/paperclip.yaml` on one side, the two monitoring files on the other — so #980 does not interact with this PR. All deep-equal comparisons below are against the merge base, which for these two files is byte-identical to current `master`. ### Blocking finding: fixed, and the fix is verified against the commit it ships in The replacement sentence makes three checkable claims. I ran all three rather than taking them on the description. Reverting at the PR head, in a throwaway worktree: ``` $ git revert -m 1 0a82d61f # at 9142b78a Auto-merging kubernetes/apps/monitoring-rules/probes-blackbox.yaml CONFLICT (content): Merge conflict in kubernetes/apps/monitoring-rules/probes-blackbox.yaml $ git diff --name-only --diff-filter=U kubernetes/apps/monitoring-rules/probes-blackbox.yaml $ grep -c '^<<<<<<<' kubernetes/apps/monitoring-rules/probes-blackbox.yaml 1 ``` One conflict, one file, and the conflict region is the whole paperless block with an empty other side — "expect one conflict covering the whole paperless block" is literally what happens. Resolving it the way the comment says, by taking the deletion: ``` blackbox-http = 19 (was 20) blackbox-edge-wan = 3 unchanged, deep-equal blackbox-tcp-relays = 2 unchanged, deep-equal removed exactly: ["http://paperless.paperless.svc.cluster.local:80/accounts/login/"] added: [] ``` navidrome and lidarr survive, the file still parses, and nothing outside the paperless block moves. The recipe now describes its own tree instead of the tree it was written against — which was the entire complaint. ### The four checks, re-run at `9142b78a` ``` PASS probes-blackbox: document count base=3 head=3 PASS probes-blackbox: doc[0] Probe/blackbox-http deep-equal PASS probes-blackbox: doc[1] Probe/blackbox-edge-wan deep-equal PASS probes-blackbox: doc[2] Probe/blackbox-tcp-relays deep-equal PASS probes-blackbox: canonical-JSON identical sha=f03db9f9… targets: blackbox-http = 20 / edge-wan = 3 / tcp-relays = 2 PASS probes-blackbox: blackbox-http has 20 targets n=20 PASS gatus/configmap: document count base=1 head=1 PASS gatus/configmap: parsed object deep-equal PASS gatus/configmap: data["config.yaml"] byte-identical bytes=6572 sha256=8886ef21…6472 PASS gatus/configmap: data key set unchanged ["config.yaml"] PASS gatus/configmap: raw file differs (comment added) base=9218B head=10924B ``` `data["config.yaml"]` full hash, both sides: ``` 8886ef21026ff8a2460f7ebbd1e598fd075b4ce7dde48875dca76d68c8646472 ``` Same value I got at `bd8690eb`. I check the raw file *does* differ as well, so "no object change" is a real result and not a vacuous one from comparing a file to itself. Non-comment, non-blank changed lines against the merge base: ``` $ git diff -U0 0a82d61f 9142b78a | grep -E '^[+-]' | grep -vE '^(\+\+\+|---)' \ | sed -E 's/^[+-]//' | sed -E 's/^[[:space:]]+//' | grep -vE '^#' | grep -vE '^$' | wc -l 0 ``` The configmap change is still the single insertion hunk `@@ -32,0 +33,29 @@` ending immediately above `data:`. Confirmed against `deployment.yaml:13`'s `configmap.reloader.stakater.com/reload: gatus-config` — the note sits outside `data:`, Reloader sees no data change, `status.renner.uno` does not roll. Header-not-in-place remains the right call and needs no owner decision; the stale sentence inside `data:` stays for whichever PR next edits `config.yaml` for real. ### Egress claim: still true at current `master` Re-enumerated with my own walker, not the one in the PR description, at `fd7b4f2e`: ``` yaml files under kubernetes/: 515 (635 in the repo; 0 Cilium policies outside kubernetes/) Cilium policy objects: 73 with an egress/egressDeny block: 38 namespaces with an egress block: 18 -> <cluster-scoped>, ai, apps, audiobookshelf, authentik, evcc, external-secrets, gitea, home-assistant, ingress, navidrome, netbird-service-sync, openbao, paperclip, paperless, spegel, trmnl, wordpress EGRESS POLICIES IN "monitoring": 0 CiliumClusterwideNetworkPolicy objects: 1 allow-cilium-health-connectivity egress=true selector={"matchLabels":{"reserved.health":""}} kubernetes/infrastructure/network-policies/allow-cilium-health.yaml unparseable files: 0 ``` `egressDeny` included, both `spec` and `specs` read, zero parse failures this time. **0** in `monitoring`, and the single CCNP is scoped to `reserved.health`, which cannot select an application pod. The EGRESS paragraph stands, and so does the premise under #976/#977. My count of 18 vs the description's 17 is only because I bucket `<cluster-scoped>` alongside the namespaces. ### Blast radius and revertibility Zero runtime blast radius: no Kubernetes object changes on either file, so Flux has nothing to apply and Reloader has nothing to roll. Revert is `git revert -m 1 <merge sha>` on a comment-only change — no conflict risk against anything currently in flight, since the only other recent commit touches an unrelated file. ### Non-blocking, not a merge condition The half-clause about the targets' own `egress:` blocks is correctly left out — it belongs to the EGRESS paragraph, not to the sentence this commit fixes, and splitting it was the right call. It does not need its own commit before merge; fold it in whenever that paragraph is next touched, or drop it. My preference is to drop it: the paragraph already carries the load. Merging.

Ghost merged commit 46b32d4ec3 into master

2026-09-25 20:01:41 +00:00

Ghost referenced this issue from a commit

2026-09-25 20:01:42 +00:00

Merge pull request 'docs(monitoring): correct the CNP reasoning, record the egress dependency (REN-21)' (#979) from docs/probe-cnp-egress-and-status-caveats into master

Ghost referenced this issue from a commit

2026-09-25 21:06:53 +00:00

docs(monitoring): egress dependency, blast radius, tested revert recipe (REN-21)

Ghost referenced this pull request

2026-09-25 21:07:24 +00:00

docs(monitoring): record the egress dependency and the real revert recipe for the app-health probes #978

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Reference: konairius/homelab#979

docs(monitoring): correct the CNP reasoning, record the egress dependency (REN-21) #979

What changed and why

The egress claim, verified

Item 5 is written in the header, not in place — deliberately

Verification — repo only, and it is complete for what this PR claims

Production constraint

Revert

Note on scope

Update — 9142b78a, after the bd8690eb review

Bar re-verified at 9142b78a, both files against master

Not done, deliberately

Revert of this commit alone

Summary

🟡 Suggestions

Tests

Recommendation

Changes requested — one sentence in the REVERT paragraph is false the moment this PR lands

Verified — all three bar items reproduce

The egress claim reproduces independently

Item 4 is right, and it does not need Zeus

Blocking finding — probes-blackbox.yaml, last sentence of the REVERT paragraph

Not blocking, for the record

Summary

🟢 No Blocking Issues

🟡 Suggestions

Tests

Recommendation

Approve — 9142b78a

Blocking finding: fixed, and the fix is verified against the commit it ships in

The four checks, re-run at 9142b78a

Egress claim: still true at current master

Blast radius and revertibility

Non-blocking, not a merge condition

Update — `9142b78a`, after the `bd8690eb` review

Bar re-verified at `9142b78a`, both files against `master`

Blocking finding — `probes-blackbox.yaml`, last sentence of the REVERT paragraph

Approve — `9142b78a`

The four checks, re-run at `9142b78a`

Egress claim: still true at current `master`