feat(obs): wire the gate-sidecar scrape, and fix the alert that would have gone silent doing it
PR #28 gave the five fleet oauth2-proxy sidecars --metrics-address=0.0.0.0:44180 and a named `metrics` port. This wires a scraper to them and, in the process, found a real bug in the alert this branch added. PodMonitor, not ServiceMonitor. Measured: no Service exposes 44180 on any of the five (jackett/radarr/sonarr/qbittorrent/pihole all publish only their app port + authproxy 4180), so a ServiceMonitor would select nothing. A PodMonitor targets pod ports directly and needs no change to catalog/render.py or the apps/wave-* renders and goldens. Selector is the pod label homelab.keithjackson.dev/auth-mode=forward-auth — present on exactly those five gate pods, absent from crafty's, which still has no metrics listener. The property, not an app list. THE BUG: `up{container="oauth2-proxy"}` -> `up{container="oauth2-proxy"} == 1`. A target that is discovered but FAILING still publishes `up`, with value 0. The series exists, so count by (namespace) returned 1, `unless` removed the namespace, and OAuth2ProxyGateUnobserved went QUIET while nothing was being scraped at all — this branch's own disease reproduced inside the alert written to cure it. Not hypothetical: the PodMonitor lands five targets whose scrape is dropped, so the bare form would have silently cleared on this very commit. Proven by mutation: reverting the `== 1` fails the two new unit-test scenarios (got: nil) and leaves every other assertion green. The scrape does NOT work yet, and that is documented rather than papered over. From a pod in ns monitoring to the jackett pod, :44180 AND :4180 both time out; the shared proxy's :44180 answers. ns jackett's default-deny is podSelector:{} with policyTypes:[Ingress,Egress] and NO ingress key (deny-all), and the one allowance is fromEntities:[ingress] to 4180 — the Gateway's Envoy only. The endpoint itself is healthy: port-forwarded, /metrics returns http=200, 10208 bytes, all three oauth2_proxy_* families including requests_total{code="302"}. Same bug and fingerprint as platform/longhorn/networkpolicy-metrics.yaml records for Longhorn; the fix is one narrow rule per app, and it cannot ship from this tier because oauth2-proxy and apps-wave-0 are Flux SIBLINGS (both dependsOn platform-config), so naming ns jackett here would apply today and fail on a cold rebuild. Needs an owner in the renderer. Touches conformance/** : one KNOWN_EXTERNAL_MONITORS entry, which is the mechanism the failing check explicitly instructs ("DECLARE it ... with who creates it") and which flux-podmonitor.yaml already uses. It records that the port name was measured on prod instead of resolved from a Service, and that the targets are currently down. That makes this PR require a non-author review on the sensitive-path rule. Also: ratio alert still NOT shipped. oauth2_proxy_requests_total now exists on the endpoint but not in the TSDB, so writing it today would make it inert for exactly the reason it was refused on 2026-09-30. Runbook gains policy-vs-no-target triage and the radarr /signalr/messages/negotiate worked case — one orphaned browser tab, 206 identical 302s, nobody ever re-prompted. Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
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@@ -124,3 +124,36 @@ and it reads the sidecar logs out of Loki (Alloy collects them; 72h retention).
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Service port, and a ServiceMonitor selecting it. Only then does the auth-churn rule — sustained
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`code="302"` as a share of `oauth2_proxy_requests_total`, held across a window longer than the
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session lifetime — become writable rather than decorative.
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### Update 2026-10-01: the listener exists; the scrape path does not
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PR #28 added `--metrics-address=0.0.0.0:44180` and a named `metrics` container port to the five
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fleet sidecars (jackett, radarr, sonarr, qbittorrent, pihole). `podmonitor.yaml` in this directory
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discovers them by the pod label `homelab.keithjackson.dev/auth-mode: forward-auth` — a **PodMonitor**
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rather than a ServiceMonitor because no Service exposes 44180 and adding one would mean changing the
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renderer.
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The endpoint is real: port-forwarded straight to the jackett pod, `/metrics` returns **http=200,
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10208 bytes**, exporting `oauth2_proxy_requests_in_flight`, `oauth2_proxy_requests_total` (with
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`code` labels) and `oauth2_proxy_response_duration_seconds`. That is verified by payload, not by the
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flag appearing in `args` — a distinction worth keeping, because the two claims came apart here.
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**The scrape is nevertheless dropped.** From a pod in ns `monitoring`, both `:44180` and `:4180` on
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the jackett pod time out; the shared proxy's `:44180` answers. The only difference is that ns
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`oauth2-proxy` has **no NetworkPolicy at all**, while each app namespace has a `default-deny` whose
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`policyTypes` include `Ingress` with no `ingress` rules (deny-all) plus a single CNP admitting
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`fromEntities: [ingress]` to port 4180 — the Gateway's Envoy and nothing else. Prometheus matches no
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clause.
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So the targets read `up == 0` and the TSDB is still empty for those namespaces. This is the same bug
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and the same fingerprint as `platform/longhorn/networkpolicy-metrics.yaml` documents for Longhorn,
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and the same narrow fix applies: ns `monitoring` → the gate pod label → TCP 44180 only. It cannot
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ship from this directory, because `oauth2-proxy` and `apps-wave-0` are **siblings** in the Flux graph
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(both `dependsOn: [platform-config]`), so a NetworkPolicy naming ns `jackett` would apply on today's
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cluster and fail on a cold rebuild. It belongs with each app's own rendered policy.
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Consequence for `auth-visibility-alerts.yaml`: its `unless` clause requires `up == 1`, not merely a
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present `up` series. A discovered-but-failing target publishes `up` with value 0, so the bare form
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would have cleared `OAuth2ProxyGateUnobserved` the moment the PodMonitor landed — reporting the gates
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as observed while nothing was being scraped. The unit test pins that scenario; deleting the `== 1`
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fails it and nothing else.
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@@ -104,7 +104,67 @@ tests:
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exp_samples: []
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# ---------------------------------------------------------------------------------------------
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# 3. NO GATE, NO ALERT. A namespace with no oauth2-proxy container must never appear, or the
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# 3. THE REGRESSION GUARD FOR `== 1` — the scenario that exposed a real bug on 2026-10-01.
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#
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# A target is DISCOVERED but every scrape FAILS: `up` exists with value 0. This is not
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# hypothetical — it is the exact state podmonitor.yaml creates today, because the app
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# namespaces' default-deny drops the scrape (measured; see podmonitor.yaml).
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#
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# With the original `unless count by (namespace) (up{container="oauth2-proxy"})`, the `up`
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# SERIES EXISTS, so `count by (namespace)` returns 1, `unless` removes the namespace, and the
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# alert GOES QUIET while nothing is being scraped at all — a green signal standing in for an
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# absent one, which is the precise disease this whole rule was written to cure. Deleting the
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# `== 1` makes THIS test fail and every other test in this file still pass, which is the
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# property that makes it worth having.
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- interval: 1m
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name: a discovered-but-FAILING target does not count as observed (up==0 must still fire)
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input_series:
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- series: 'kube_pod_container_info{container="oauth2-proxy",container_id="containerd://937ae6fc",endpoint="http",image="quay.io/oauth2-proxy/oauth2-proxy:v7.8.1",image_id="quay.io/oauth2-proxy/oauth2-proxy@sha256:d62e2d81",image_spec="quay.io/oauth2-proxy/oauth2-proxy:v7.8.1",instance="10.0.1.213:8080",job="kube-state-metrics",namespace="jackett",pod="jackett-6877fcd9f5-ht9d9",service="kube-prometheus-stack-kube-state-metrics",uid="5b57d48f-e7d3-4050-9cd1-16aaaa052996"}'
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values: '1x130'
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# The PodMonitor target exists and never succeeds: NetworkPolicy drops the packets, so the
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# scrape times out and `up` is published as 0 rather than going absent.
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- series: 'up{container="oauth2-proxy",endpoint="metrics",instance="10.0.0.189:44180",job="oauth2-proxy-sidecars",namespace="jackett",pod="jackett-6877fcd9f5-ht9d9"}'
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values: '0x130'
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promql_expr_test:
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- expr: 'ALERTS{alertname="OAuth2ProxyGateUnobserved",alertstate="firing",namespace="jackett"}'
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eval_time: 65m
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exp_samples:
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- labels: 'ALERTS{alertname="OAuth2ProxyGateUnobserved",alertstate="firing",namespace="jackett",severity="warning"}'
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value: 1
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# And the inner clause itself yields NOTHING while the scrape is failing — which is the
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# mechanism the alert depends on, asserted directly so a future reader can see why the
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# `== 1` matters without re-deriving it. (Scenario 4 below covers the other direction:
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# a succeeding scrape really does clear the alert, so `== 1` has not made the rule
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# impossible to satisfy.)
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- expr: 'count by (namespace) (up{container="oauth2-proxy"} == 1)'
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eval_time: 65m
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exp_samples: []
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# ---------------------------------------------------------------------------------------------
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# 4. A FLAPPING target: up goes 1 -> 0 and stays there. The alert must come BACK, not latch
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# cleared. Covers the ordering bug where a once-observed namespace is permanently excluded.
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- interval: 1m
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name: a target that starts working and then fails re-fires
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input_series:
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- series: 'kube_pod_container_info{container="oauth2-proxy",container_id="containerd://937ae6fc",endpoint="http",image="quay.io/oauth2-proxy/oauth2-proxy:v7.8.1",image_id="quay.io/oauth2-proxy/oauth2-proxy@sha256:d62e2d81",image_spec="quay.io/oauth2-proxy/oauth2-proxy:v7.8.1",instance="10.0.1.213:8080",job="kube-state-metrics",namespace="radarr",pod="radarr-7d55cbffb9-42hmh",service="kube-prometheus-stack-kube-state-metrics",uid="3333cccc-0000-0000-0000-000000000001"}'
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values: '1x250'
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# Healthy for the first 60m, then every scrape fails for the rest.
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- series: 'up{container="oauth2-proxy",endpoint="metrics",instance="10.0.1.77:44180",job="oauth2-proxy-sidecars",namespace="radarr",pod="radarr-7d55cbffb9-42hmh"}'
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values: '1x60 0x180'
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promql_expr_test:
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# Quiet while it was working.
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- expr: 'ALERTS{alertname="OAuth2ProxyGateUnobserved",namespace="radarr"}'
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eval_time: 55m
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exp_samples: []
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# Firing again an hour after it broke.
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- expr: 'ALERTS{alertname="OAuth2ProxyGateUnobserved",alertstate="firing",namespace="radarr"}'
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eval_time: 125m
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exp_samples:
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- labels: 'ALERTS{alertname="OAuth2ProxyGateUnobserved",alertstate="firing",namespace="radarr",severity="warning"}'
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value: 1
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# ---------------------------------------------------------------------------------------------
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# 5. NO GATE, NO ALERT. A namespace with no oauth2-proxy container must never appear, or the
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# rule would page for every app on the platform the day someone widened the matcher.
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- interval: 1m
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name: namespaces without a gate sidecar are never reported
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@@ -33,10 +33,18 @@
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# $ promtool query instant :9090 'count by (__name__) ({__name__=~"oauth2_proxy.*"})'
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# oauth2_proxy_requests_in_flight => 2 <- the SHARED proxy's two replicas. That is ALL.
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#
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# Every sidecar (crafty, jackett, pihole, qbittorrent, radarr, sonarr) runs with
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# PARTLY SUPERSEDED 2026-10-01, and the correction matters more than the original. PR #28 gave
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# the five FLEET sidecars `--metrics-address=0.0.0.0:44180` and a named `metrics` port, and the
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# endpoint genuinely serves (verified by payload: http=200, 10208 bytes, all three
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# `oauth2_proxy_*` families present — not merely by the flag being in `args`). podmonitor.yaml
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# in this directory now discovers them. But the scrape is still DROPPED by the app namespaces'
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# default-deny ingress, so the TSDB remains empty for those namespaces; and crafty still has no
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# metrics listener at all. The rule below is unchanged in purpose and still has work to do.
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#
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# Every sidecar (crafty, jackett, pihole, qbittorrent, radarr, sonarr) ran with
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# `--http-address=0.0.0.0:4180` and NO `--metrics-address`, so oauth2-proxy's metrics listener
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# is never started; the container declares only port `http:4180`, there is no `metrics` port on
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# any of their Services, and there is no ServiceMonitor or PodMonitor for any of them anywhere
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# was never started; the container declared only port `http:4180`, there was no `metrics` port on
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# any of their Services, and there was no ServiceMonitor or PodMonitor for any of them anywhere
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# in the cluster (measured: `kubectl get servicemonitors,podmonitors -A`). Six gates, zero
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# telemetry. An alert written against `oauth2_proxy_requests_total{namespace="jackett"}` would
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# have been PERMANENTLY INERT — present, evaluating, silent, and indistinguishable from health.
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@@ -81,15 +89,31 @@ spec:
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# Nothing in this expression touches `oauth2_proxy_*`, so the rule cannot itself be
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# inert for the reason it is reporting.
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#
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# MEASURED ON PROD 2026-09-30 — this expression returns six namespaces right now:
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# MEASURED ON PROD 2026-09-30 — this expression returned six namespaces:
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# {namespace="crafty"} {namespace="jackett"} {namespace="pihole"}
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# {namespace="qbittorrent"} {namespace="radarr"} {namespace="sonarr"}
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# and excludes namespace="oauth2-proxy", whose two replicas ARE scraped. It fires on
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# and excluded namespace="oauth2-proxy", whose two replicas ARE scraped. It fires on
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# the state the cluster is in; it is not a rule waiting for a hypothetical.
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#
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# `== 1` IS LOAD-BEARING, AND IT IS A BUG FIX (2026-10-01). This clause was originally
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# a bare `up{container="oauth2-proxy"}`, which was WRONG in the one way that matters
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# here: a target that is DISCOVERED BUT FAILING still publishes `up`, with value 0. So
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# the series exists, `count by (namespace)` returns 1, `unless` removes the namespace,
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# and the alert GOES QUIET while nothing whatsoever is being scraped. That is this
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# branch's own disease — a green signal standing in for an absent one — reproduced
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# inside the alert written to cure it. It was not hypothetical: podmonitor.yaml lands
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# five targets whose scrape is DROPPED by NetworkPolicy (measured; see that file), so
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# the bare form would have silently cleared on the very next commit. `== 1` means
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# "observed" requires a scrape that actually succeeds.
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#
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# A failing target is therefore reported by BOTH this rule and kube-prometheus-stack's
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# generic TargetDown. That duplication is deliberate: TargetDown says "a target is
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# down", this says "an authentication gate is unobserved", and during an incident those
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# are different sentences. The overlap is the cheap half of the trade.
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expr: |
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count by (namespace) (kube_pod_container_info{container="oauth2-proxy"})
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unless
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count by (namespace) (up{container="oauth2-proxy"})
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count by (namespace) (up{container="oauth2-proxy"} == 1)
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# 1h, not 5m: a rollout briefly has a running sidecar whose target has not been
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# discovered yet, and this condition is a standing architectural gap, never an
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# emergency. Long enough that no deploy can produce it.
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@@ -18,3 +18,8 @@ resources:
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# for the same reason it does: monitoring.coreos.com CRDs are registered by the `platform`
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# tier, which is Ready before this tier's platform-config dependency completes.
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- auth-visibility-alerts.yaml
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# Discovers the PER-APP gate sidecars' :44180 metrics endpoints by pod label (PR #28 added the
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# listener; no Service exposes it, so this is a PodMonitor, not a ServiceMonitor). The scrape is
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# still denied by the app namespaces' default-deny ingress — read podmonitor.yaml's header
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# before concluding the targets should be up.
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- podmonitor.yaml
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@@ -0,0 +1,109 @@
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---
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# PodMonitor for the PER-APP oauth2-proxy gate sidecars (R-OBS-04).
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#
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# ============================================================================================
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# WHY A PodMonitor AND NOT A ServiceMonitor
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# ============================================================================================
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# PR #28 gave all five fleet sidecars `--metrics-address=0.0.0.0:44180` and a named `metrics`
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# container port. It did NOT add a Service port, and measured on prod 2026-10-01 none of the five
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# Services exposes 44180:
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#
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# jackett jackett: [('port-9117', 9117), ('authproxy', 4180)]
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# radarr radarr: [('port-7878', 7878), ('authproxy', 4180)]
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# sonarr sonarr: [('port-8989', 8989), ('authproxy', 4180)]
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# qbittorrent qbittorrent: [('port-8080', 8080), ('authproxy', 4180)]
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# pihole pihole: [('port-80', 80), ('authproxy', 4180)]
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#
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# A ServiceMonitor selects Service PORTS, so it would have nothing to select. A PodMonitor targets
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# pod ports directly and bypasses Services entirely — so this needs no change to the Services, and
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# therefore no change to `catalog/render.py` or the `apps/wave-*` renders and goldens.
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#
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# SELECTOR: the `homelab.keithjackson.dev/auth-mode: forward-auth` POD LABEL, not a namespace list.
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# Measured 2026-10-01: that label is present on exactly the five fleet gate pods (jackett, radarr,
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# sonarr, qbittorrent, pihole) and absent from crafty's, which is a separately-managed deployment
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# (platform/crafty) that still has no `--metrics-address` at all. So the selector describes the
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# PROPERTY being scraped rather than enumerating today's apps, and a sixth forward-auth app is
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# picked up with no edit here. `namespaceSelector.any: true` because those five namespaces are
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# created by the apps-wave-0/1 tiers, which this tier does not and must not depend on.
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#
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# ============================================================================================
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# READ THIS BEFORE BELIEVING THE TARGETS ARE UP: THE SCRAPE IS CURRENTLY DENIED BY NETWORKPOLICY
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# ============================================================================================
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# This PodMonitor is NECESSARY AND NOT SUFFICIENT. The endpoint serves, and the path from ns
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# monitoring is blocked. Both halves measured on prod 2026-10-01, read-only:
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#
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# THE ENDPOINT IS HEALTHY — port-forward straight to the jackett pod's 44180:
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# GET /metrics -> http=200 bytes=10208
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# # TYPE oauth2_proxy_requests_in_flight gauge
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# # TYPE oauth2_proxy_requests_total counter
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# # TYPE oauth2_proxy_response_duration_seconds histogram
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# oauth2_proxy_requests_total{code="200"} 3
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# oauth2_proxy_requests_total{code="302"} 2
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#
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# THE SCRAPE PATH IS DROPPED — from a pod in ns monitoring (grafana, which sits beside
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# Prometheus and so occupies the same policy position) to the jackett pod IP:
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# http://10.0.0.189:44180/metrics -> wget: download timed out
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# http://10.0.0.189:4180/ping -> wget: download timed out (even the "allowed" port)
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# http://<shared-proxy>:44180/metrics -> 200, oauth2_proxy_* present (control: ns oauth2-proxy
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# has NO NetworkPolicy, which is the only reason the
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# shared instance has ever been scrapable)
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#
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# WHY: ns jackett's `default-deny` NetworkPolicy is `podSelector: {}` with
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# `policyTypes: [Ingress, Egress]` and an `egress` rule ONLY — no `ingress` key, which in
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# NetworkPolicy semantics is deny-all-ingress. The only ingress allowance is the CNP
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# `jackett-allow-gateway-ingress`: `fromEntities: [ingress]` to port 4180 — the Gateway's Envoy
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# and nothing else. Prometheus matches no clause and its packets are dropped, not refused.
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#
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# SO THE TARGETS BELOW WILL READ `up == 0` UNTIL AN INGRESS ALLOWANCE LANDS. That is a known,
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# measured, documented state — NOT a regression introduced here, and NOT something to silence.
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# It is deliberately left visible: `OAuth2ProxyGateUnobserved` in auth-visibility-alerts.yaml
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# requires `up == 1`, precisely so a discovered-but-failing target does not read as "observed"
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# (see that file's header — this exact trap is why the `== 1` is there).
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#
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# THIS IS THE SAME BUG LONGHORN HAD, and the platform has a documented fix idiom for it:
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# platform/longhorn/networkpolicy-metrics.yaml, whose header records the identical fingerprint
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# measured on 2026-09-13 — ServiceMonitor in place, 3 targets DISCOVERED, `up` 0/0/0, TSDB empty,
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# `lastError: context deadline exceeded` (a drop, not a refusal). The fix there is a narrow
|
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# additive `networking.k8s.io/v1` NetworkPolicy: ns monitoring -> the pod label, that one port.
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#
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# WHY THAT POLICY IS NOT IN THIS DIRECTORY. It would have to be five objects, one per app
|
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# namespace, and those namespaces are created by apps-wave-0/1. Measured Flux graph, 2026-10-01:
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# oauth2-proxy dependsOn=['platform-config'] <- this tier
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# apps-wave-0 dependsOn=['platform-config'] <- SIBLING, no ordering between them
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# apps-wave-1 dependsOn=['apps-wave-0']
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# They are siblings, so on a cold bootstrap there is no guarantee ns jackett exists when this tier
|
||||
# applies, and a NetworkPolicy naming a missing namespace fails to apply. It would work on today's
|
||||
# running cluster and break on a rebuild — the "works now, broken on restore" shape this repo
|
||||
# keeps paying for. Longhorn's precedent is safe only because longhorn-system is created by the
|
||||
# same tier that ships its policy. The allowance therefore belongs WITH THE APPS, rendered next to
|
||||
# the rest of each app's network policy — i.e. in the catalog/renderer, which is in flight on
|
||||
# another branch. Tracked in the handoff; it is one narrow rule per app, not a redesign.
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apiVersion: monitoring.coreos.com/v1
|
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kind: PodMonitor
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metadata:
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name: oauth2-proxy-sidecars
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namespace: oauth2-proxy
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labels:
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release: kube-prometheus-stack # kube-prometheus-stack's podMonitorSelector
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app.kubernetes.io/name: oauth2-proxy
|
||||
homelab.keithjackson.dev/purpose: metrics-scrape
|
||||
spec:
|
||||
namespaceSelector:
|
||||
# The gate sidecars live in the app namespaces, not this one. `any` rather than a fixed list so
|
||||
# a new forward-auth app needs no edit here — the pod label below is what scopes this.
|
||||
any: true
|
||||
selector:
|
||||
matchLabels:
|
||||
# The PROPERTY, not the app list. Present on exactly the five fleet gate pods (measured
|
||||
# 2026-10-01); absent from crafty, which has no metrics listener yet.
|
||||
homelab.keithjackson.dev/auth-mode: forward-auth
|
||||
podMetricsEndpoints:
|
||||
# By PORT NAME (`metrics`, 44180), never by number: the name is what PR #28 declared on the
|
||||
# container, and a numeric port here would silently stop matching if the port were renumbered.
|
||||
- port: metrics
|
||||
path: /metrics
|
||||
interval: 30s
|
||||
# 10s, matching the drop signature above: a DENIED path does not refuse, it hangs until the
|
||||
# scrape times out. Leaving the default would make each failing target hold a scrape slot for
|
||||
# the full interval.
|
||||
scrapeTimeout: 10s
|
||||
Reference in new issue
Block a user