Merge pull request 'fix(paperless): probe a real Django view instead of a TCP connect' (#703) from paperless-http-probes into master

Reviewed-on: k.renner/homelab#703

kubernetes/apps/paperless/paperless.yaml

@@ -155,21 +155,33 @@ spec:
             - name: bridge-cert
               mountPath: /shared
               readOnly: true
-          # TCP probes — HTTP probes against /api/ flooded the
-          # `paperless.auth` logger every 10 s with "No authentication
-          # provided from private IP …". With ENABLE_HTTP_REMOTE_USER
-          # the middleware logs every unauth API request, and there's
-          # no public health endpoint to probe. TCP confirms gunicorn
-          # is bound; that's the same liveness signal we'd get from
-          # /api/ minus the noise.
+          # /accounts/login/ rather than /api/ or a TCP connect.
+          #
+          # /api/ is unusable as a probe target: with ENABLE_HTTP_REMOTE_USER
+          # the remote-user middleware logs "No authentication provided from
+          # private IP …" for every unauthenticated API request, so probing it
+          # floods `paperless.auth`. Measured: four requests to /api/ produce
+          # four log lines, four to /accounts/login/ produce none — the
+          # middleware only covers the API surface.
+          #
+          # A TCP connect avoids the noise but only proves gunicorn accepted a
+          # socket. /accounts/login/ renders a real Django view, so URL
+          # routing, settings and templating all have to work. It does not
+          # prove Postgres is healthy; nothing cheap here does.
+          #
+          # Safe against ALLOWED_HOSTS: the kubelet sends the pod IP as Host,
+          # and PAPERLESS_ALLOWED_HOSTS is "*". Narrowing that value later
+          # means giving these probes an explicit Host header.
           livenessProbe:
-            tcpSocket:
+            httpGet:
+              path: /accounts/login/
               port: http
             initialDelaySeconds: 120
             periodSeconds: 30
             timeoutSeconds: 10
           readinessProbe:
-            tcpSocket:
+            httpGet:
+              path: /accounts/login/
               port: http
             initialDelaySeconds: 30
             periodSeconds: 10