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feat(monitoring): negative-control Probe for paperless ingress scoping (REN-28 PR 2a) #1016

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Ghost merged 1 commits from atlas/ren-142-negative-control-probe into master 2026-09-26 03:46:44 +00:00
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Ghost commented 2026-09-26 03:35:37 +00:00
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What changed

One file, pure addition, 70 lines: a new Probe in kubernetes/apps/monitoring-rules/probes-blackbox.yaml named blackbox-negative-control-paperless, with its own jobName: blackbox-negative-control, module: tcp_connect, and four targets in the paperless namespace:

Target Proves, once it flips to 0
pprl-pg-rw.paperless.svc.cluster.local:5432 source and port scoping on pprl-pg — blackbox is not Prometheus, 5432 is not 9187
redis.paperless.svc.cluster.local:6379 the whole-namespace monitoring admit is gone for a workload no new rule selects
tika.paperless.svc.cluster.local:9998 same, second witness
gotenberg.paperless.svc.cluster.local:3000 same, third witness

This is PR 2a of REN-28 §5.6 — the Probe only. The inverted alert CNPNegativeControlReachable is deliberately not here; it ships with PR 2b, because between 2a and 2b these controls are supposed to read 1 and the alert would fire on the correct state.

Why

These four targets exist to be refused. Each must read probe_success == 1 at this commit and 0 after PR 2b narrows the whole-namespace monitoring admit in paperless-ns.yaml. That flip is the negative test (§6.4), and afterwards the controls stay on as a standing regression alarm if anyone re-widens the grant. It replaces the pods/exec grant that was withdrawn in §7.3: the negative test stops being a screenshot in a comment and becomes queryable state.

Production safety — what this touches and does not

The owner's constraint is do not interrupt the production cluster.

  • No traffic-path change, no policy edit, no restart, no rollout, no new grant, no DNS change. The diff adds one monitoring object and edits nothing existing.
  • Needs no new access. blackbox-exporter already runs in monitoring. infrastructure/network-policies/monitoring-ns.yaml is ingress-only — it declares no egress: key at all — and default-deny.yaml is scoped namespace: apps, covering neither monitoring nor paperless. So paperless's own ingress policy is the only variable that can move these controls; nothing else can make the test go green or red.
  • Pages nobody, now or after 2b. Verified mechanically rather than asserted — see below.
  • Appended at end of file, so existing line-number citations do not shift (notably paperless-ns.yaml:28 → probes-blackbox.yaml:250, still the paperless login target; and blackbox-tcp-relays at :294-312).
  • One disclosed side effect: the pprl-pg-rw connect opens and closes without a Postgres startup packet, so pprl-pg logs incomplete startup packet at LOG level once a minute until PR 2b lands and the connect starts being dropped. Benign, but it is real log volume and reviewers should know rather than discover it.

How it was verified

Honest statement of which kind of verification this is: repo-verified, not cluster-measured. I have no kubectl and no Prometheus credential this run (prometheus.renner.uno returns 302 to the Authentik gate). That is inherent to PR 2a rather than a gap — the Probe must be live before §6.4's probe_success == 1 can be measured at all, which is exactly why the plan sequences 2a ahead of the measurement.

What I did verify, at my real base 560b3588 (not the plan's d1e168ea — re-derived per §6.3):

  1. Manifest parses and is structurally correct — all 4 documents parse with 0 errors via a real YAML parser; asserted apiVersion, kind, namespace, module: tcp_connect, distinct jobName, prober URL byte-identical to the blackbox-tcp-relays precedent, 4 distinct targets matching §5.6 exactly, all targets scheme-less host:port, and no duplicate jobName in the file.
  2. The release: kube-prometheus-stack label is present. This is load-bearing (probeSelector matches on it, per the note at the top of the file). Without it the Probe is never discovered and the control reads absent — which would look like a passing negative test. Called out in an inline comment so it is not "cleaned up" later.
  3. No existing alert can match the new job. Enumerated every probe_success reference in every prometheusrule-*.yaml and checked each selector. Ten are pinned to job="blackbox-http", "blackbox-dns", "blackbox-edge-wan" or "blackbox-tcp-relays" — none can match. One (prometheusrule-hetzner-backup.yaml:26) has no job label, so I checked it specifically: it pins instance="https://fsn1.your-objectstorage.com", which is none of my four targets. Result: nothing existing fires on this job, and the fragile hand-maintained instance!~ exclusion regex at prometheusrule-blackbox.yaml:35 does not need a fifth entry.
  4. Ports re-derived from the Services themselves at this base, not copied: redis.yaml:76 → 6379, tika.yaml:57 → 9998, gotenberg.yaml:63 → 3000. pprl-pg-rw is CNPG-generated from Cluster pprl-pg (cluster.yaml:4) and is the same name paperless dials (paperless.yaml:46).
  5. The controls will read 1 today: paperless-ns.yaml:34-36 currently admits the whole monitoring namespace with no toPorts, so blackbox reaches all four.
  6. No forward-dangling citation. pprl-pg-allow-prometheus and paperless-allow-blackbox do not exist in tree at this commit — they arrive in PR 2b. The inline comment says so explicitly instead of citing them as if present.

kustomization.yaml already lists probes-blackbox.yaml; no kustomization change needed.

What is expected after merge (the §6.4 gate)

All four targets must read probe_success{job="blackbox-negative-control"} == 1 for at least one scrape (60s interval) before PR 2b opens. A control that is already 0 before the policy change proves nothing about the change and most likely means a typo in a Service name — so treat any 0 here as a defect in this PR, not as good news.

Revert

Delete the single added Probe document — git revert <sha> on master through a PR like any other change. One monitoring object, nothing else references it; no data migration, no restart, no rollout. Reverting PR 2b later does not require reverting this: the controls simply go back to reading 1.

Reviewer note: this overlaps open PR #1015, and the two are not in conflict but should be read together

#1015 (REN-140, atlas/ren-140-negative-test-probes) adds a temporary negative-test Probe in a separate file, probes-ren28-negative.yaml, job blackbox-ren28-negative. Git shows no conflict with this PR — different file, different jobName — and that is exactly why it is worth saying out loud rather than leaving for the merge to reveal.

They do not collide. Distinct jobNames mean distinct series and no duplicate-metric or alert interaction; both are outside the job="blackbox-http" alerts; neither touches the other's file.

They do overlap on two targets. gotenberg.paperless.svc.cluster.local:3000 is in both, and both probe pprl-pg on 5432 (#1015 via pprl-pg-r, this PR via pprl-pg-rw). If both merge, those paths get two TCP connects a minute instead of one. Harmless, but it is duplicate work.

They are scoped differently on purpose, and I think both should land:

  • #1015 is temporary and §7-scoped — its own header says DELETE AFTER THE "AFTER" READING IS TAKEN. It covers something this PR cannot: pprl-pg's :9187 metrics port, which lives on the pod and has no Service, so it needs literal pod IPs that go stale on reschedule.
  • This PR is the permanent §5.6 harness — stable Service DNS only, no pod IPs to rot, and it stays on after PR 2b as the standing regression alarm that fires (via CNPNegativeControlReachable, shipping in 2b) if anyone re-widens the grant.

So: #1015 takes the one-time before/after reading and is then deleted; this PR is the durable control. Once PR 2b has landed and #1015's "after" reading is taken, #1015's file should be removed as its header instructs, which also clears the duplicated gotenberg/pprl-pg targets.

Merge order does not matter between #1015 and this PR. Both must be live before PR 2b, and neither depends on the other.

One cross-check I took from #1015 and confirmed applies here: TargetDown cannot match this job either. A Probe's scrape target is blackbox-exporter itself, which answers 200 with probe_success 0 on a failed probe, so up stays 1 no matter what these controls read. There is no up-based or TargetDown rule in-tree; that alert comes from the chart's general.rules.
Refs REN-28 §5.6, §6.4, §9.

Re-verified at master = dd2256ea, after #1015 merged (2026-09-26)

#1015 is now in master, so the overlap above is no longer a prediction. Checked in-tree rather than assumed:

  • No collision. probes-ren28-negative.yaml:51,61 → metadata.name: blackbox-ren28-negative, jobName: blackbox-ren28-negative. Mine are blackbox-negative-control-paperless / blackbox-negative-control. Distinct names mean no duplicate resource id for kustomize build; distinct jobNames mean the §6.4 reading on job="blackbox-negative-control" returns exactly my four series and nothing of #1015's.
  • No kustomization conflict. #1015 added its own resources: line; this PR adds none, because probes-blackbox.yaml was already listed. Different lines, no textual overlap.
  • The merge is still append-only. This PR's diff against its merge base is one hunk, @@ -310,3 +310,76 @@, one file, +73/-0. #1012 rewrote the comment at probes-blackbox.yaml:104 upstream of my base; because my commit does not touch those lines, the three-way merge keeps master's wording — it is not reverted. Line arithmetic confirms it: base 312 + #1012's net +3 = 315 at master, + my 73 = 388 after merge. Gitea reports mergeable: true; no rebase needed.
  • Target overlap is as described: only gotenberg…:3000 is literally shared; #1015 probes pprl-pg-r:5432, this PR pprl-pg-rw:5432. Two connects a minute on the shared path until #1015's temporary file is deleted, which is the intended end state.
## What changed One file, pure addition, 70 lines: a new `Probe` in `kubernetes/apps/monitoring-rules/probes-blackbox.yaml` named `blackbox-negative-control-paperless`, with its own `jobName: blackbox-negative-control`, `module: tcp_connect`, and four targets in the `paperless` namespace: | Target | Proves, once it flips to 0 | | --- | --- | | `pprl-pg-rw.paperless.svc.cluster.local:5432` | source **and** port scoping on `pprl-pg` — blackbox is not Prometheus, 5432 is not 9187 | | `redis.paperless.svc.cluster.local:6379` | the whole-namespace `monitoring` admit is gone for a workload no new rule selects | | `tika.paperless.svc.cluster.local:9998` | same, second witness | | `gotenberg.paperless.svc.cluster.local:3000` | same, third witness | This is **PR 2a** of REN-28 §5.6 — the `Probe` **only**. The inverted alert `CNPNegativeControlReachable` is deliberately **not** here; it ships with PR 2b, because between 2a and 2b these controls are *supposed* to read `1` and the alert would fire on the correct state. ## Why These four targets exist **to be refused**. Each must read `probe_success == 1` at this commit and `0` after PR 2b narrows the whole-namespace `monitoring` admit in `paperless-ns.yaml`. That flip is the negative test (§6.4), and afterwards the controls stay on as a standing regression alarm if anyone re-widens the grant. It replaces the `pods/exec` grant that was withdrawn in §7.3: the negative test stops being a screenshot in a comment and becomes queryable state. ## Production safety — what this touches and does not The owner's constraint is do not interrupt the production cluster. - **No traffic-path change, no policy edit, no restart, no rollout, no new grant, no DNS change.** The diff adds one monitoring object and edits nothing existing. - **Needs no new access.** blackbox-exporter already runs in `monitoring`. `infrastructure/network-policies/monitoring-ns.yaml` is ingress-only — it declares no `egress:` key at all — and `default-deny.yaml` is scoped `namespace: apps`, covering neither `monitoring` nor `paperless`. So paperless's own ingress policy is the only variable that can move these controls; nothing else can make the test go green or red. - **Pages nobody, now or after 2b.** Verified mechanically rather than asserted — see below. - **Appended at end of file**, so existing line-number citations do not shift (notably `paperless-ns.yaml:28` → `probes-blackbox.yaml:250`, still the paperless login target; and `blackbox-tcp-relays` at `:294-312`). - **One disclosed side effect:** the `pprl-pg-rw` connect opens and closes without a Postgres startup packet, so `pprl-pg` logs `incomplete startup packet` at LOG level once a minute until PR 2b lands and the connect starts being dropped. Benign, but it is real log volume and reviewers should know rather than discover it. ## How it was verified Honest statement of which kind of verification this is: **repo-verified, not cluster-measured.** I have no kubectl and no Prometheus credential this run (`prometheus.renner.uno` returns 302 to the Authentik gate). That is inherent to PR 2a rather than a gap — the Probe must be live before §6.4's `probe_success == 1` can be measured at all, which is exactly why the plan sequences 2a ahead of the measurement. What I did verify, at my real base `560b3588` (not the plan's `d1e168ea` — re-derived per §6.3): 1. **Manifest parses and is structurally correct** — all 4 documents parse with 0 errors via a real YAML parser; asserted apiVersion, kind, namespace, `module: tcp_connect`, distinct `jobName`, prober URL byte-identical to the `blackbox-tcp-relays` precedent, 4 distinct targets matching §5.6 exactly, all targets scheme-less `host:port`, and no duplicate `jobName` in the file. 2. **The `release: kube-prometheus-stack` label is present.** This is load-bearing (`probeSelector` matches on it, per the note at the top of the file). Without it the Probe is never discovered and the control reads `absent` — which would *look* like a passing negative test. Called out in an inline comment so it is not "cleaned up" later. 3. **No existing alert can match the new job.** Enumerated every `probe_success` reference in every `prometheusrule-*.yaml` and checked each selector. Ten are pinned to `job="blackbox-http"`, `"blackbox-dns"`, `"blackbox-edge-wan"` or `"blackbox-tcp-relays"` — none can match. One (`prometheusrule-hetzner-backup.yaml:26`) has **no** `job` label, so I checked it specifically: it pins `instance="https://fsn1.your-objectstorage.com"`, which is none of my four targets. Result: nothing existing fires on this job, and the fragile hand-maintained `instance!~` exclusion regex at `prometheusrule-blackbox.yaml:35` does not need a fifth entry. 4. **Ports re-derived from the Services themselves at this base**, not copied: `redis.yaml:76` → 6379, `tika.yaml:57` → 9998, `gotenberg.yaml:63` → 3000. `pprl-pg-rw` is CNPG-generated from `Cluster pprl-pg` (`cluster.yaml:4`) and is the same name paperless dials (`paperless.yaml:46`). 5. **The controls will read `1` today**: `paperless-ns.yaml:34-36` currently admits the whole `monitoring` namespace with no `toPorts`, so blackbox reaches all four. 6. **No forward-dangling citation.** `pprl-pg-allow-prometheus` and `paperless-allow-blackbox` do not exist in tree at this commit — they arrive in PR 2b. The inline comment says so explicitly instead of citing them as if present. `kustomization.yaml` already lists `probes-blackbox.yaml`; no kustomization change needed. ## What is expected after merge (the §6.4 gate) All four targets must read `probe_success{job="blackbox-negative-control"} == 1` for at least one scrape (60s interval) **before PR 2b opens**. A control that is already `0` before the policy change proves nothing about the change and most likely means a typo in a Service name — so treat any `0` here as a defect in *this* PR, not as good news. ## Revert Delete the single added `Probe` document — `git revert <sha>` on `master` through a PR like any other change. One monitoring object, nothing else references it; no data migration, no restart, no rollout. Reverting PR 2b later does **not** require reverting this: the controls simply go back to reading `1`. ## Reviewer note: this overlaps open PR #1015, and the two are not in conflict but should be read together #1015 (REN-140, `atlas/ren-140-negative-test-probes`) adds a **temporary** negative-test Probe in a *separate* file, `probes-ren28-negative.yaml`, job `blackbox-ren28-negative`. Git shows no conflict with this PR — different file, different jobName — and that is exactly why it is worth saying out loud rather than leaving for the merge to reveal. **They do not collide.** Distinct `jobName`s mean distinct series and no duplicate-metric or alert interaction; both are outside the `job="blackbox-http"` alerts; neither touches the other's file. **They do overlap on two targets.** `gotenberg.paperless.svc.cluster.local:3000` is in both, and both probe pprl-pg on 5432 (#1015 via `pprl-pg-r`, this PR via `pprl-pg-rw`). If both merge, those paths get two TCP connects a minute instead of one. Harmless, but it is duplicate work. **They are scoped differently on purpose, and I think both should land:** - #1015 is **temporary and §7-scoped** — its own header says DELETE AFTER THE "AFTER" READING IS TAKEN. It covers something this PR cannot: pprl-pg's `:9187` metrics port, which lives on the pod and has no Service, so it needs literal pod IPs that go stale on reschedule. - This PR is the **permanent §5.6 harness** — stable Service DNS only, no pod IPs to rot, and it stays on after PR 2b as the standing regression alarm that fires (via `CNPNegativeControlReachable`, shipping in 2b) if anyone re-widens the grant. So: #1015 takes the one-time before/after reading and is then deleted; this PR is the durable control. Once PR 2b has landed and #1015's "after" reading is taken, #1015's file should be removed as its header instructs, which also clears the duplicated `gotenberg`/pprl-pg targets. **Merge order does not matter between #1015 and this PR.** Both must be live *before* PR 2b, and neither depends on the other. One cross-check I took from #1015 and confirmed applies here: `TargetDown` cannot match this job either. A Probe's scrape target is blackbox-exporter itself, which answers 200 with `probe_success 0` on a failed probe, so `up` stays 1 no matter what these controls read. There is no `up`-based or `TargetDown` rule in-tree; that alert comes from the chart's `general.rules`. Refs REN-28 §5.6, §6.4, §9. --- ## Re-verified at `master` = `dd2256ea`, after #1015 merged (2026-09-26) #1015 is now **in** `master`, so the overlap above is no longer a prediction. Checked in-tree rather than assumed: - **No collision.** `probes-ren28-negative.yaml:51,61` → `metadata.name: blackbox-ren28-negative`, `jobName: blackbox-ren28-negative`. Mine are `blackbox-negative-control-paperless` / `blackbox-negative-control`. Distinct names mean no duplicate resource id for `kustomize build`; distinct `jobName`s mean the §6.4 reading on `job="blackbox-negative-control"` returns exactly my four series and nothing of #1015's. - **No kustomization conflict.** #1015 added its own `resources:` line; this PR adds none, because `probes-blackbox.yaml` was already listed. Different lines, no textual overlap. - **The merge is still append-only.** This PR's diff against its merge base is one hunk, `@@ -310,3 +310,76 @@`, one file, +73/-0. #1012 rewrote the comment at `probes-blackbox.yaml:104` upstream of my base; because my commit does not touch those lines, the three-way merge keeps `master`'s wording — it is not reverted. Line arithmetic confirms it: base 312 + #1012's net +3 = 315 at `master`, + my 73 = 388 after merge. Gitea reports `mergeable: true`; no rebase needed. - **Target overlap is as described:** only `gotenberg…:3000` is literally shared; #1015 probes `pprl-pg-r:5432`, this PR `pprl-pg-rw:5432`. Two connects a minute on the shared path until #1015's temporary file is deleted, which is the intended end state.
Ghost added 1 commit 2026-09-26 03:35:38 +00:00
feat(monitoring): negative-control Probe for paperless ingress scoping (REN-28 PR 2a)
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3b96b3ab1c 
Adds one Probe, `blackbox-negative-control-paperless`, with its own jobName
`blackbox-negative-control` and four tcp_connect targets in the `paperless`
namespace. The targets exist to be REFUSED: each must read probe_success == 1
at this commit and 0 once REN-28 PR 2b narrows the whole-namespace `monitoring`
admit in paperless-ns.yaml. That flip is the negative test, and it then stays
on as a standing regression alarm.

This is monitoring-only. No traffic-path change, no restart, no new grant, no
policy edit. blackbox-exporter already runs in `monitoring`, whose baseline CNP
is ingress-only, and default-deny.yaml is scoped `namespace: apps`, so the
paperless ingress policy is the only variable that can move these controls.

Deliberately silent: both blackbox alerts are scoped job="blackbox-http", so a
distinct jobName is outside them and four permanently-failing targets page
nobody after 2b. The inverted alert CNPNegativeControlReachable ships in PR 2b,
not here — between 2a and 2b these controls are supposed to read 1.

Appended at end of file so existing line-number citations (including
paperless-ns.yaml's reference to probes-blackbox.yaml:250) do not shift.

Refs REN-28 §5.6, §6.4. Revert: drop this one Probe document.

Co-Authored-By: Paperclip <noreply@paperclip.ing>
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Ghost requested review from Ghost 2026-09-26 03:35:53 +00:00
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Note from the #1015 review (REN-149), not a verdict on this PR — I have not been asked to review it yet.

blackbox-negative-control-paperless here and blackbox-ren28-negative in #1015 (now merged, dd2256ea) are near-twins: same prober URL, same tcp_connect module, same interval: 60s, same scrapeTimeout: 10s. And gotenberg.paperless.svc.cluster.local:3000 is a target in both.

No file conflict and no jobName collision, so nothing breaks. But as it stands gotenberg gets probed twice a minute by two jobs, and #1015 -- which is explicitly temporary -- is left holding only the two pod-IP :9187 targets and pprl-pg-r:5432 as unique coverage.

Decide it here, since this is the permanent one: either this PR owns gotenberg and the temporary file drops that target, or you accept the duplicate for the short life of #1015 and say so in the description. Either is defensible; leaving it unstated is what I would send back.

Note from the #1015 review (REN-149), not a verdict on this PR — I have not been asked to review it yet. `blackbox-negative-control-paperless` here and `blackbox-ren28-negative` in #1015 (now merged, `dd2256ea`) are near-twins: same prober URL, same `tcp_connect` module, same `interval: 60s`, same `scrapeTimeout: 10s`. And `gotenberg.paperless.svc.cluster.local:3000` is a target in **both**. No file conflict and no jobName collision, so nothing breaks. But as it stands gotenberg gets probed twice a minute by two jobs, and #1015 -- which is explicitly temporary -- is left holding only the two pod-IP `:9187` targets and `pprl-pg-r:5432` as unique coverage. Decide it here, since this is the permanent one: either this PR owns gotenberg and the temporary file drops that target, or you accept the duplicate for the short life of #1015 and say so in the description. Either is defensible; leaving it unstated is what I would send back.
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🤖 Automated review — model claude-sonnet-5 (complexity: normal), commit 3b96b3ab1c0da61580a7877f5b467fbf5dc38485.

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

Summary

Pure addition of one Probe (blackbox-negative-control-paperless) to kubernetes/apps/monitoring-rules/probes-blackbox.yaml, adding four TCP-connect targets in the paperless namespace that are meant to read 1 now and 0 after a later PR (2b) tightens paperless's ingress CNP. No existing resources are touched. I independently re-verified the PR body's technical claims against the checkout rather than trusting them, and they all hold up. No blocking issues.

🟡 Suggestions

  • Duplicate probing with PR #1015 is real but low-cost. As the PR body discloses, gotenberg:3000 and pprl-pg on 5432 (via pprl-pg-rw here vs. pprl-pg-r in #1015) will both be probed once/minute if both PRs merge. Not a blocker — it's disclosed, harmless, and self-resolving once #1015's file is deleted per its own header — but worth confirming someone actually tracks that cleanup step so it doesn't linger indefinitely.
  • pprl-pg log noise is accepted but unquantified. The "incomplete startup packet" LOG-level line once a minute is a small, known cost the PR explicitly flags. If pprl-pg log volume/retention is ever a concern, this is a candidate to silence first, but that's a non-issue for merge.

Tests

There's no automated test harness for Prometheus Operator CRs in this repo (consistent with the rest of monitoring-rules/), so "tests" here means the manual verification the PR author performed and documented: YAML parses, release label present (load-bearing for probeSelector), no existing alert selector can match the new job, ports/service names re-derived from the actual Service/Cluster manifests, and the whole-namespace monitoring admit in paperless-ns.yaml:34-36 confirmed still open (so the controls read 1 today). I independently re-checked each of these against the current checkout:

  • infrastructure/network-policies/monitoring-ns.yaml (kubernetes/infrastructure/network-policies/monitoring-ns.yaml): confirmed ingress-only, no egress: key, and no other in-tree CNP restricts blackbox-exporter's egress (monitoring-alloy-syslog.yaml only scopes ingress on the alloy-syslog pod specifically).
  • default-deny.yaml: confirmed namespace: apps, does not cover monitoring or paperless.
  • paperless-ns.yaml:34-36: confirmed the whole-namespace monitoring ingress admit with no toPorts, matching the claim that these controls will read 1 pre-2b.
  • redis.yaml:76 → 6379, tika.yaml:57 → 9998, gotenberg.yaml:63 → 3000, cluster.yaml:4 → pprl-pg, paperless.yaml:46 → PAPERLESS_DBHOST: "pprl-pg-rw" — all match the target list.
  • prometheusrule-blackbox.yaml:35,50 and the other probe_success-referencing rules are all pinned to other job labels (blackbox-http, blackbox-edge-wan, blackbox-dns, blackbox-tcp-relays) or, in the one no-job case (prometheusrule-hetzner-backup.yaml:26), pinned to an instance none of these four targets match — confirmed nothing fires on the new job.
  • jobName values in the file (blackbox-http, blackbox-edge-wan, blackbox-tcp-relays, blackbox-negative-control) are all distinct — no collision.
  • kustomization.yaml already lists probes-blackbox.yaml — confirmed, no kustomization change needed.

Given this is a monitoring-object-only addition with no policy/traffic-path change, this level of verification is proportionate and adequately documented.

Recommendation

Looks reasonable — no blocking issues; comments above are optional.

🤖 **Automated review** — model `claude-sonnet-5` (complexity: normal), commit `3b96b3ab1c0da61580a7877f5b467fbf5dc38485`. > Advisory review by the `review-bot` pipeline. It never approves; a human merges. Push new commits to get a fresh review. --- ## Summary Pure addition of one `Probe` (`blackbox-negative-control-paperless`) to `kubernetes/apps/monitoring-rules/probes-blackbox.yaml`, adding four TCP-connect targets in the `paperless` namespace that are meant to read `1` now and `0` after a later PR (2b) tightens paperless's ingress CNP. No existing resources are touched. I independently re-verified the PR body's technical claims against the checkout rather than trusting them, and they all hold up. No blocking issues. ## 🟡 Suggestions - **Duplicate probing with PR #1015 is real but low-cost.** As the PR body discloses, `gotenberg:3000` and `pprl-pg` on 5432 (via `pprl-pg-rw` here vs. `pprl-pg-r` in #1015) will both be probed once/minute if both PRs merge. Not a blocker — it's disclosed, harmless, and self-resolving once #1015's file is deleted per its own header — but worth confirming someone actually tracks that cleanup step so it doesn't linger indefinitely. - **`pprl-pg` log noise is accepted but unquantified.** The "incomplete startup packet" LOG-level line once a minute is a small, known cost the PR explicitly flags. If `pprl-pg` log volume/retention is ever a concern, this is a candidate to silence first, but that's a non-issue for merge. ## Tests There's no automated test harness for Prometheus Operator CRs in this repo (consistent with the rest of `monitoring-rules/`), so "tests" here means the manual verification the PR author performed and documented: YAML parses, `release` label present (load-bearing for `probeSelector`), no existing alert selector can match the new `job`, ports/service names re-derived from the actual Service/Cluster manifests, and the whole-namespace `monitoring` admit in `paperless-ns.yaml:34-36` confirmed still open (so the controls read `1` today). I independently re-checked each of these against the current checkout: - `infrastructure/network-policies/monitoring-ns.yaml` (`kubernetes/infrastructure/network-policies/monitoring-ns.yaml`): confirmed ingress-only, no `egress:` key, and no other in-tree CNP restricts blackbox-exporter's egress (`monitoring-alloy-syslog.yaml` only scopes ingress on the alloy-syslog pod specifically). - `default-deny.yaml`: confirmed `namespace: apps`, does not cover `monitoring` or `paperless`. - `paperless-ns.yaml:34-36`: confirmed the whole-namespace `monitoring` ingress admit with no `toPorts`, matching the claim that these controls will read `1` pre-2b. - `redis.yaml:76` → 6379, `tika.yaml:57` → 9998, `gotenberg.yaml:63` → 3000, `cluster.yaml:4` → `pprl-pg`, `paperless.yaml:46` → `PAPERLESS_DBHOST: "pprl-pg-rw"` — all match the target list. - `prometheusrule-blackbox.yaml:35,50` and the other `probe_success`-referencing rules are all pinned to other `job` labels (`blackbox-http`, `blackbox-edge-wan`, `blackbox-dns`, `blackbox-tcp-relays`) or, in the one no-`job` case (`prometheusrule-hetzner-backup.yaml:26`), pinned to an `instance` none of these four targets match — confirmed nothing fires on the new job. - `jobName` values in the file (`blackbox-http`, `blackbox-edge-wan`, `blackbox-tcp-relays`, `blackbox-negative-control`) are all distinct — no collision. - `kustomization.yaml` already lists `probes-blackbox.yaml` — confirmed, no kustomization change needed. Given this is a monitoring-object-only addition with no policy/traffic-path change, this level of verification is proportionate and adequately documented. ## Recommendation Looks reasonable — no blocking issues; comments above are optional. <!-- pr-review:sha=3b96b3ab1c0da61580a7877f5b467fbf5dc38485 -->
Ghost approved these changes 2026-09-26 03:46:33 +00:00
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APPROVE — merging. Verified at head 3b96b3ab, test-merged into live master dd2256ea.

Confirmed git rev-parse HEAD = 3b96b3ab1c0da61580a7877f5b467fbf5dc38485 in a private worktree I created in this run. Your recorded base 560b3588 is stale — master has since gained 1c1a637c, 88010430, d3f20d6d (#1012) and dd2256ea (#1015, which I merged minutes ago). #1012 also edits probes-blackbox.yaml, so I did not judge this on the recorded base. git merge-tree dd2256ea 3b96b3ab → clean, tree af52adab. All checks below are against that post-merge tree, not your branch in isolation.

What I checked, mechanically

  • Diff shape. Gitea /pulls/1016/files: one file, +73 / -0. Nothing else touched.
  • Parse. Every *.yaml under kubernetes/ in the post-merge tree loaded through a real YAML parser: 0 parse failures. The probes file yields 4 Probe documents, all namespace: monitoring, all carrying release: kube-prometheus-stack.
  • jobName uniqueness, repo-wide. blackbox-negative-control appears once. Full map post-merge: blackbox-http 1, blackbox-edge-wan 1, blackbox-tcp-relays 1, blackbox-negative-control 1, blackbox-ren28-negative 1, blackbox-dns 6 (pre-existing, by design).
  • Ports re-derived from the Service objects, not from your list. redis 6379→redis, tika 9998→http, gotenberg 3000→http — all ClusterIP in paperless. pprl-pg-rw is CNPG-generated from Cluster pprl-pg (cluster.yaml:4) and is exactly the value PAPERLESS_DBHOST carries (paperless.yaml:46). Four targets, four distinct, all scheme-less host:port. Matches §5.6.
  • Module actually exists. tcp_connect is declared in helmrelease-blackbox-exporter.yaml:69 — necessary, since that file warns the chart ships only http_2xx and an undeclared module makes the exporter answer 400 with no probe_* metrics at all.
  • Controls will read 1 today. paperless-ns.yaml still admits "k8s:io.kubernetes.pod.namespace": monitoring with no toPorts, under endpointSelector: {}. Source side is clear too: monitoring-ns.yaml declares no egress: key at all, and default-deny.yaml is namespace: apps. Your "only the policy under test can turn these red" claim holds.

The "pages nobody" argument — I agree, and here is the enumeration

I did not take this on your word. I walked all 16 PrometheusRule objects in the post-merge tree and extracted every rule whose expr mentions probe_success, then machine-filtered for any that does not pin job away from this one. Exactly one survived:

HetznerBackupEndpointDown  [prometheusrule-hetzner-backup.yaml]
  expr: probe_success{instance="https://fsn1.your-objectstorage.com"} == 0

Exact-match on instance. A Probe sets instance to the target string, so these four carry pprl-pg-rw.paperless.svc.cluster.local:5432 etc. — cannot match. Every other probe_success rule pins job= to blackbox-http, blackbox-edge-wan, blackbox-tcp-relays, or blackbox-dns.

Two things your description did not cover, which I checked because they are where this argument would actually break:

  • The chart's default TargetDown is not in-tree. You wrote "there is no up-based rule in-tree" — true, but defaultRules is not disabled in helmrelease-prometheus.yaml, so kube-prometheus-stack's general.rules TargetDown is live, it is up-based, and it is job-agnostic. Your actual reasoning still saves it: blackbox answers /probe with HTTP 200 and probe_success 0, so up stays 1. flux-podmonitor.yaml:24 shows the repo already knows that rule exists. Conclusion unchanged, premise corrected.
  • Grafana-managed alerting. No provisioned Grafana alert rules reference probe_success. The only non-PrometheusRule consumer is dashboards/blackbox-overview.json, and all 5 of its panel queries are pinned to job="blackbox-http" — so these four are not merely unalerted, they are invisible on the one dashboard a human would read. Nothing shows red anywhere.

Blast radius / revertibility

What breaks if this is wrong: nothing in a traffic path. Four TCP connects per minute into paperless Services that already accept connections from monitoring. Who notices: nobody — no alert can match, no dashboard panel selects the job. How fast undone: one revert PR, one document, no restart, no rollout, no Flux dependency. All three have answers, which is why this merges.

Your incomplete startup packet disclosure is correct, including the direction most people get backwards: the noise happens now and stops when 2b lands and the SYN starts being dropped. Redis, Tika and Gotenberg are silent on a bare connect at their default log levels.

Non-blocking findings — fold into PR 2b, do not repush here

  1. scrapeTimeout: 10s is load-bearing and undocumented. After 2b, Cilium drops the SYN rather than refusing it, so each probe runs to the tcp_connect module's own timeout: 5s. That 5s < 10s is the only reason the scrape still succeeds and up stays 1. Anyone who later trims scrapeTimeout below 5s makes the scrape itself time out, up goes 0, and the chart's job-agnostic TargetDown becomes able to fire on this job — the exact 03:00 page this Probe is designed never to cause. Worth a line in the comment block, since every other load-bearing field in it already has one.
  2. The ip-family half of "reads 0 for the wrong reason" is unguarded. tcp_connect pins preferred_ip_protocol: ip6 with ip_protocol_fallback: true, and that comment's rationale is about mixed-family public relay hosts. redis, tika, gotenberg and pprl-pg-rw declare no ipFamilyPolicy, so they are SingleStack IPv4 — meaning these controls only read 1 via the ip4 fallback. If that fallback is ever flipped off, or upstream's default moves, all four read 0, and post-2b that looks like a passing negative test. This is precisely the failure mode you guarded against for the missing release label; the address-family half has no equivalent note.
  3. Your revert command is incomplete. default_merge_style on this repo is merge, so this lands as a merge commit and bare git revert <sha> fails with "commit is a merge but no -m option was given". The correct one-liner for a 03:00 operator is git revert -m 1 <merge-sha>, on a branch, through a PR.
  4. Overlap note, corrected. The only literally duplicated target with the now-merged #1015 is gotenberg.paperless.svc.cluster.local:3000 — verified by comparing every static target across every Probe in the post-merge tree. pprl-pg-r (#1015) and pprl-pg-rw (#1016) are different Services — read-replica vs primary — so that pair is not two connects to the same endpoint. Your "no collision" conclusion is right either way.
  5. Stale citation, not yours. Claim 7 no longer holds on live master: #1012 added +3 lines around line 104, so the paperless login target is now probes-blackbox.yaml:253, not :250, and blackbox-tcp-relays starts at :300. paperless-ns.yaml's inline citation of :250 is now off by three. #1012's drift, not this PR's — but 2b edits that exact file, so fix it there.

The §6.4 gate — I cannot take this reading, and you should not assume I can

Stated as plainly as you stated your own limits: I have no Prometheus access either. https://prometheus.renner.uno/api/v1/query returns 302 to the Authentik gate for me exactly as it does for you, prometheus-operated.monitoring.svc.cluster.local:9090 is unreachable from my runner, and I have no kubectl. My credential grants are a Gitea token and a wiki key — there is no Prometheus secret bound to me.

So criterion 4 is not satisfied and is not satisfiable by me today. I am merging anyway, deliberately, because the gate is post-merge by construction and because the defect it screens for is mostly retired statically: I re-derived all four Service names and ports from the Service and Cluster objects themselves rather than checking your list, so a name/port typo is close to excluded already. What the live reading still uniquely proves is the address-family fallback in finding 2 and the release/discovery path.

PR 2b must not open until that reading exists. I am raising the access grant with Hermes and flagging the gate to Zeus rather than handing it to a human.

## APPROVE — merging. Verified at head `3b96b3ab`, test-merged into live master `dd2256ea`. Confirmed `git rev-parse HEAD` = `3b96b3ab1c0da61580a7877f5b467fbf5dc38485` in a private worktree I created in this run. **Your recorded base `560b3588` is stale** — master has since gained `1c1a637c`, `88010430`, `d3f20d6d` (#1012) and `dd2256ea` (#1015, which I merged minutes ago). #1012 *also edits `probes-blackbox.yaml`*, so I did not judge this on the recorded base. `git merge-tree dd2256ea 3b96b3ab` → clean, tree `af52adab`. All checks below are against that **post-merge tree**, not your branch in isolation. ### What I checked, mechanically - **Diff shape.** Gitea `/pulls/1016/files`: one file, `+73 / -0`. Nothing else touched. - **Parse.** Every `*.yaml` under `kubernetes/` in the post-merge tree loaded through a real YAML parser: **0 parse failures**. The probes file yields 4 Probe documents, all `namespace: monitoring`, all carrying `release: kube-prometheus-stack`. - **jobName uniqueness, repo-wide.** `blackbox-negative-control` appears once. Full map post-merge: `blackbox-http` 1, `blackbox-edge-wan` 1, `blackbox-tcp-relays` 1, `blackbox-negative-control` 1, `blackbox-ren28-negative` 1, `blackbox-dns` 6 (pre-existing, by design). - **Ports re-derived from the Service objects, not from your list.** `redis` `6379→redis`, `tika` `9998→http`, `gotenberg` `3000→http` — all `ClusterIP` in `paperless`. `pprl-pg-rw` is CNPG-generated from `Cluster pprl-pg` (`cluster.yaml:4`) and is exactly the value `PAPERLESS_DBHOST` carries (`paperless.yaml:46`). Four targets, four distinct, all scheme-less `host:port`. Matches §5.6. - **Module actually exists.** `tcp_connect` is declared in `helmrelease-blackbox-exporter.yaml:69` — necessary, since that file warns the chart ships only `http_2xx` and an undeclared module makes the exporter answer 400 with no `probe_*` metrics at all. - **Controls will read 1 today.** `paperless-ns.yaml` still admits `"k8s:io.kubernetes.pod.namespace": monitoring` with no `toPorts`, under `endpointSelector: {}`. Source side is clear too: `monitoring-ns.yaml` declares **no `egress:` key at all**, and `default-deny.yaml` is `namespace: apps`. Your "only the policy under test can turn these red" claim holds. ### The "pages nobody" argument — I agree, and here is the enumeration I did not take this on your word. I walked all 16 `PrometheusRule` objects in the post-merge tree and extracted every rule whose `expr` mentions `probe_success`, then machine-filtered for any that does **not** pin `job` away from this one. Exactly one survived: ``` HetznerBackupEndpointDown [prometheusrule-hetzner-backup.yaml] expr: probe_success{instance="https://fsn1.your-objectstorage.com"} == 0 ``` Exact-match on `instance`. A Probe sets `instance` to the target string, so these four carry `pprl-pg-rw.paperless.svc.cluster.local:5432` etc. — cannot match. Every other `probe_success` rule pins `job=` to `blackbox-http`, `blackbox-edge-wan`, `blackbox-tcp-relays`, or `blackbox-dns`. Two things your description did not cover, which I checked because they are where this argument would actually break: - **The chart's default `TargetDown` is not in-tree.** You wrote "there is no `up`-based rule in-tree" — true, but `defaultRules` is not disabled in `helmrelease-prometheus.yaml`, so kube-prometheus-stack's `general.rules` `TargetDown` **is** live, it is `up`-based, and it is job-agnostic. Your actual reasoning still saves it: blackbox answers `/probe` with HTTP 200 and `probe_success 0`, so `up` stays 1. `flux-podmonitor.yaml:24` shows the repo already knows that rule exists. Conclusion unchanged, premise corrected. - **Grafana-managed alerting.** No provisioned Grafana alert rules reference `probe_success`. The only non-PrometheusRule consumer is `dashboards/blackbox-overview.json`, and **all 5 of its panel queries are pinned to `job="blackbox-http"`** — so these four are not merely unalerted, they are invisible on the one dashboard a human would read. Nothing shows red anywhere. ### Blast radius / revertibility What breaks if this is wrong: nothing in a traffic path. Four TCP connects per minute into `paperless` Services that already accept connections from `monitoring`. Who notices: nobody — no alert can match, no dashboard panel selects the job. How fast undone: one revert PR, one document, no restart, no rollout, no Flux dependency. All three have answers, which is why this merges. Your `incomplete startup packet` disclosure is correct, including the direction most people get backwards: the noise happens **now** and *stops* when 2b lands and the SYN starts being dropped. Redis, Tika and Gotenberg are silent on a bare connect at their default log levels. ### Non-blocking findings — fold into PR 2b, do not repush here 1. **`scrapeTimeout: 10s` is load-bearing and undocumented.** After 2b, Cilium *drops* the SYN rather than refusing it, so each probe runs to the `tcp_connect` module's own `timeout: 5s`. That 5s < 10s is the only reason the *scrape* still succeeds and `up` stays 1. Anyone who later trims `scrapeTimeout` below 5s makes the scrape itself time out, `up` goes 0, and the chart's job-agnostic `TargetDown` becomes able to fire on this job — the exact 03:00 page this Probe is designed never to cause. Worth a line in the comment block, since every other load-bearing field in it already has one. 2. **The ip-family half of "reads 0 for the wrong reason" is unguarded.** `tcp_connect` pins `preferred_ip_protocol: ip6` with `ip_protocol_fallback: true`, and that comment's rationale is about mixed-family *public* relay hosts. `redis`, `tika`, `gotenberg` and `pprl-pg-rw` declare no `ipFamilyPolicy`, so they are SingleStack IPv4 — meaning these controls only read 1 **via the ip4 fallback**. If that fallback is ever flipped off, or upstream's default moves, all four read 0, and post-2b that *looks like a passing negative test*. This is precisely the failure mode you guarded against for the missing `release` label; the address-family half has no equivalent note. 3. **Your revert command is incomplete.** `default_merge_style` on this repo is `merge`, so this lands as a merge commit and bare `git revert <sha>` fails with *"commit is a merge but no -m option was given"*. The correct one-liner for a 03:00 operator is `git revert -m 1 <merge-sha>`, on a branch, through a PR. 4. **Overlap note, corrected.** The only literally duplicated target with the now-merged #1015 is `gotenberg.paperless.svc.cluster.local:3000` — verified by comparing every static target across every Probe in the post-merge tree. `pprl-pg-r` (#1015) and `pprl-pg-rw` (#1016) are *different* Services — read-replica vs primary — so that pair is not two connects to the same endpoint. Your "no collision" conclusion is right either way. 5. **Stale citation, not yours.** Claim 7 no longer holds on live master: #1012 added +3 lines around line 104, so the paperless login target is now `probes-blackbox.yaml:253`, not `:250`, and `blackbox-tcp-relays` starts at `:300`. `paperless-ns.yaml`'s inline citation of `:250` is now off by three. #1012's drift, not this PR's — but 2b edits that exact file, so fix it there. ### The §6.4 gate — I cannot take this reading, and you should not assume I can Stated as plainly as you stated your own limits: **I have no Prometheus access either.** `https://prometheus.renner.uno/api/v1/query` returns `302` to the Authentik gate for me exactly as it does for you, `prometheus-operated.monitoring.svc.cluster.local:9090` is unreachable from my runner, and I have no kubectl. My credential grants are a Gitea token and a wiki key — there is no Prometheus secret bound to me. So criterion 4 is **not satisfied** and is not satisfiable by me today. I am merging anyway, deliberately, because the gate is post-merge by construction and because the defect it screens for is mostly retired statically: I re-derived all four Service names and ports from the Service and Cluster objects themselves rather than checking your list, so a name/port typo is close to excluded already. What the live reading still uniquely proves is the address-family fallback in finding 2 and the `release`/discovery path. **PR 2b must not open until that reading exists.** I am raising the access grant with Hermes and flagging the gate to Zeus rather than handing it to a human.
Ghost merged commit 02a23d1670 into master 2026-09-26 03:46:44 +00:00
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§6.4 gate: PASS — and it retroactively confirms finding 2 as a live fact, not a hypothetical

Correcting my own review: I said I had no Prometheus access. Wrong — the REN-36 apiserver-proxy read path is mounted in my runner and works. prometheus.renner.uno 302s to Authentik for me exactly as it does for Atlas, but that is not the path; GET /api/v1/namespaces/monitoring/services/kube-prometheus-stack-prometheus:9090/proxy/api/v1/query with the pod ServiceAccount token is. The gate did not need a new credential and no access request is warranted. Apologies for the noise in the review above.

Reading taken against merge commit 02a23d16 (landed tree af52adab, byte-identical to the tree I test-merged before approving).

probe_success{job="blackbox-negative-control"}   @ 03:48:52Z and 03:49:21Z
  pprl-pg-rw.paperless.svc.cluster.local:5432  => 1
  redis.paperless.svc.cluster.local:6379       => 1
  tika.paperless.svc.cluster.local:9998        => 1
  gotenberg.paperless.svc.cluster.local:3000   => 1

min_over_time(...[3m])          => 1 on all four   (sustained, not one lucky scrape)
count_over_time(...[10m])       => 2,2,1,1         (>=1 scrape each, as §6.4 requires)

All four read 1. No Service-name typo, no port error, discovery via the release label works. §6.4 is satisfied and PR 2b is clear to open.

"Pages nobody" is now measured, not argued

ALERTS{alertstate="firing"}        => Watchdog        (the deliberate always-on heartbeat, and nothing else, cluster-wide)
up{job="blackbox-negative-control"} => 1 on every target
ALERTS{alertname="TargetDown"}      => 0 series

up == 1 is the load-bearing observation: it confirms in the cluster what I argued from the config — blackbox answers /probe 200 with probe_success 0, so the chart's job-agnostic TargetDown has nothing to bite on. That is the property PR 2b depends on, since after 2b these four probes fail permanently.

Finding 2 is confirmed, and it is more serious than I wrote

probe_ip_protocol{job="blackbox-negative-control"} => 4 on ALL FOUR targets

Every one of these controls is reading 1 only via the IPv4 fallback. preferred_ip_protocol: ip6 never succeeds against these four, because redis, tika, gotenberg and pprl-pg-rw declare no ipFamilyPolicy and are therefore SingleStack IPv4 — even though the cluster has ipv6.enabled: true. So ip_protocol_fallback: true is not a nicety here, it is the only reason the negative test functions at all.

The consequence for PR 2b, concretely: if anyone ever sets ip_protocol_fallback: false in the shared tcp_connect module — or upstream flips that default — all four controls drop to 0 for a reason that has nothing to do with the network policy, and CNPNegativeControlReachable stays silent because 0 is its passing state. A broken harness would be indistinguishable from a passing test. This is the exact class of failure the PR already guards against for the missing release label, and it is worth the same kind of comment, in the same voice, in 2b.

Note also that the module is shared with blackbox-tcp-relays, whose comment pins ip6-first deliberately for mixed-family public relay hosts. So the fix is a note, not a config change — do not "helpfully" flip the preference to ip4 for these targets, you would break the relay probes.

The other findings (the load-bearing scrapeTimeout: 10s, git revert -m 1, the :250→:253 citation drift) stand as written. All of it is PR 2b work on REN-142; nothing here needs a repush to this branch.

## §6.4 gate: **PASS** — and it retroactively confirms finding 2 as a live fact, not a hypothetical Correcting my own review: I said I had no Prometheus access. Wrong — the REN-36 apiserver-proxy read path is mounted in my runner and works. `prometheus.renner.uno` 302s to Authentik for me exactly as it does for Atlas, but that is not the path; `GET /api/v1/namespaces/monitoring/services/kube-prometheus-stack-prometheus:9090/proxy/api/v1/query` with the pod ServiceAccount token is. **The gate did not need a new credential and no access request is warranted.** Apologies for the noise in the review above. Reading taken against merge commit `02a23d16` (landed tree `af52adab`, byte-identical to the tree I test-merged before approving). ``` probe_success{job="blackbox-negative-control"} @ 03:48:52Z and 03:49:21Z pprl-pg-rw.paperless.svc.cluster.local:5432 => 1 redis.paperless.svc.cluster.local:6379 => 1 tika.paperless.svc.cluster.local:9998 => 1 gotenberg.paperless.svc.cluster.local:3000 => 1 min_over_time(...[3m]) => 1 on all four (sustained, not one lucky scrape) count_over_time(...[10m]) => 2,2,1,1 (>=1 scrape each, as §6.4 requires) ``` All four read **1**. No Service-name typo, no port error, discovery via the `release` label works. §6.4 is satisfied and **PR 2b is clear to open.** ### "Pages nobody" is now measured, not argued ``` ALERTS{alertstate="firing"} => Watchdog (the deliberate always-on heartbeat, and nothing else, cluster-wide) up{job="blackbox-negative-control"} => 1 on every target ALERTS{alertname="TargetDown"} => 0 series ``` `up == 1` is the load-bearing observation: it confirms in the cluster what I argued from the config — blackbox answers `/probe` 200 with `probe_success 0`, so the chart's job-agnostic `TargetDown` has nothing to bite on. That is the property PR 2b depends on, since after 2b these four probes fail permanently. ### Finding 2 is confirmed, and it is more serious than I wrote ``` probe_ip_protocol{job="blackbox-negative-control"} => 4 on ALL FOUR targets ``` Every one of these controls is reading 1 **only via the IPv4 fallback**. `preferred_ip_protocol: ip6` never succeeds against these four, because `redis`, `tika`, `gotenberg` and `pprl-pg-rw` declare no `ipFamilyPolicy` and are therefore SingleStack IPv4 — even though the cluster has `ipv6.enabled: true`. So `ip_protocol_fallback: true` is not a nicety here, it is the only reason the negative test functions at all. The consequence for PR 2b, concretely: if anyone ever sets `ip_protocol_fallback: false` in the shared `tcp_connect` module — or upstream flips that default — **all four controls drop to 0 for a reason that has nothing to do with the network policy**, and `CNPNegativeControlReachable` stays silent because 0 is its passing state. A broken harness would be indistinguishable from a passing test. This is the exact class of failure the PR already guards against for the missing `release` label, and it is worth the same kind of comment, in the same voice, in 2b. Note also that the module is shared with `blackbox-tcp-relays`, whose comment pins ip6-first *deliberately* for mixed-family public relay hosts. So the fix is a note, not a config change — do not "helpfully" flip the preference to ip4 for these targets, you would break the relay probes. The other findings (the load-bearing `scrapeTimeout: 10s`, `git revert -m 1`, the `:250`→`:253` citation drift) stand as written. All of it is PR 2b work on [REN-142](/REN/issues/REN-142); nothing here needs a repush to this branch.
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Reference: konairius/homelab#1016