monitoring: silencia 4 alertas que llevaban meses sin significar nada

Tres eran falsos positivos de k3s: KubeControllerManagerDown, KubeSchedulerDown
y KubeProxyDown llevaban 92 DÍAS disparadas en severidad critical. En k3s esos
tres componentes van embebidos en el proceso del servidor y no exponen las
métricas que espera el chart, así que sus ServiceMonitors nunca conectaban: la
alerta no medía la salud de nada, solo la ausencia de un target imposible.

La cuarta, PrometheusNotConnectedToAlertmanagers, llevaba disparada desde el
reinicio del máster del 16-jul. La causa es de diseño: alertmanager.enabled es
false y los avisos van por Grafana→Telegram y Kuma→Telegram. Ya se había
desactivado el grupo de reglas `alertmanager`, pero esta alerta vive en el
grupo `prometheus`, así que sobrevivió; se quita por nombre con
defaultRules.disabled.

Tres "critical" permanentes no son un aviso, son entrenamiento para ignorar el
panel: cuando algo se rompa de verdad, se perderá entre el ruido.

Hecho por Helm y no a mano (rev 1 → 2, mismo chart 83.2.0), que es lo único que
sobrevive a un futuro upgrade. Verificado ANTES de aplicar renderizando el chart
con y sin los valores nuevos: el diff quita exactamente esas 4 alertas (141 →
137) y ningún recurso nuevo aparece. Comprobado además que el render reproduce
el manifiesto ya desplegado, o sea que no había ediciones a mano que el upgrade
fuese a aplastar.

Después: 1 sola alerta disparada (Watchdog, el latido intencionado del chart,
severity none) y los 15 targets de scrape en up — antes 3 fallaban siempre.
Grafana sano (api/health ok, 12.4.2) y su contraseña rotada intacta, porque
GF_SECURITY_ADMIN_PASSWORD solo aplica en el primer arranque.

Se añade values-kube-prometheus-stack.yaml: este namespace no está bajo ArgoCD y
hasta hoy los valores del release solo vivían dentro de Helm, sin forma de saber
cómo estaba configurado sin interrogarlo. Se refresca el export del ConfigMap de
reglas y se borran 3 dashboards que el upgrade eliminó del cluster.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

monitoring/configmap-kube-prometheus-stack-controller-manager.yaml

@@ -1,60 +0,0 @@
-apiVersion: v1
-data:
-  controller-manager.json: '{"editable":true,"links":[{"asDropdown":true,"includeVars":true,"keepTime":true,"tags":["kubernetes-mixin"],"targetBlank":false,"title":"Kubernetes","type":"dashboards"}],"panels":[{"datasource":{"type":"datasource","uid":"--
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-    job=\"kube-controller-manager\"})","instant":true}],"title":"Up","type":"stat"},{"datasource":{"type":"datasource","uid":"--
-    Mixed --"},"fieldConfig":{"defaults":{"custom":{"fillOpacity":10,"showPoints":"never","spanNulls":true},"unit":"ops"}},"gridPos":{"h":7,"w":20,"x":4,"y":0},"id":2,"interval":"1m","options":{"legend":{"asTable":true,"calcs":["lastNotNull"],"displayMode":"table","placement":"right","showLegend":true},"tooltip":{"mode":"single"}},"pluginVersion":"v11.4.0","targets":[{"datasource":{"type":"prometheus","uid":"${datasource}"},"expr":"sum(rate(workqueue_adds_total{cluster=\"$cluster\",
-    job=\"kube-controller-manager\", instance=~\"$instance\"}[$__rate_interval]))
-    by (cluster, instance, name)","legendFormat":"{{cluster}} {{instance}} {{name}}"}],"title":"Work
-    Queue Add Rate","type":"timeseries"},{"datasource":{"type":"datasource","uid":"--
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-    job=\"kube-controller-manager\", instance=~\"$instance\"}[$__rate_interval]))
-    by (cluster, instance, name)","legendFormat":"{{cluster}} {{instance}} {{name}}"}],"title":"Work
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-    sum(rate(workqueue_queue_duration_seconds_bucket{cluster=\"$cluster\", job=\"kube-controller-manager\",
-    instance=~\"$instance\"}[$__rate_interval])) by (cluster, instance, name, le))","legendFormat":"{{cluster}}
-    {{instance}} {{name}}"}],"title":"Work Queue Latency","type":"timeseries"},{"datasource":{"type":"datasource","uid":"--
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-    job=\"kube-controller-manager\",instance=~\"$instance\"}","legendFormat":"{{instance}}"}],"title":"Goroutines","type":"timeseries"}],"refresh":"10s","schemaVersion":39,"tags":["kubernetes-mixin"],"templating":{"list":[{"current":{"selected":true,"text":"default","value":"default"},"hide":0,"label":"Data
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-    "utc","title":"Kubernetes / Controller Manager","uid":"72e0e05bef5099e5f049b05fdc429ed4"}'
-kind: ConfigMap
-metadata:
-  annotations:
-    meta.helm.sh/release-name: kube-prometheus-stack
-    meta.helm.sh/release-namespace: monitoring
-  labels:
-    app: kube-prometheus-stack-grafana
-    app.kubernetes.io/instance: kube-prometheus-stack
-    app.kubernetes.io/managed-by: Helm
-    app.kubernetes.io/part-of: kube-prometheus-stack
-    app.kubernetes.io/version: 83.2.0
-    chart: kube-prometheus-stack-83.2.0
-    grafana_dashboard: '1'
-    heritage: Helm
-    release: kube-prometheus-stack
-  name: kube-prometheus-stack-controller-manager
-  namespace: monitoring
-

monitoring/configmap-kube-prometheus-stack-proxy.yaml

@@ -1,62 +0,0 @@
-apiVersion: v1
-data:
-  proxy.json: '{"editable":true,"links":[{"asDropdown":true,"includeVars":true,"keepTime":true,"tags":["kubernetes-mixin"],"targetBlank":false,"title":"Kubernetes","type":"dashboards"}],"panels":[{"datasource":{"type":"datasource","uid":"--
-    Mixed --"},"fieldConfig":{"defaults":{"unit":"none"}},"gridPos":{"h":7,"w":4,"x":0,"y":0},"id":1,"interval":"1m","options":{"colorMode":"none"},"pluginVersion":"v11.4.0","targets":[{"datasource":{"type":"prometheus","uid":"${datasource}"},"expr":"sum(up{cluster=\"$cluster\",
-    job=\"kube-proxy\"})","instant":true}],"title":"Up","type":"stat"},{"datasource":{"type":"datasource","uid":"--
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-    job=\"kube-proxy\", instance=~\"$instance\"}[$__rate_interval]))","legendFormat":"rate"}],"title":"Rules
-    Sync Rate","type":"timeseries"},{"datasource":{"type":"datasource","uid":"-- Mixed
-    --"},"fieldConfig":{"defaults":{"custom":{"fillOpacity":10,"showPoints":"never","spanNulls":true},"unit":"s"}},"gridPos":{"h":7,"w":10,"x":14,"y":0},"id":3,"interval":"1m","options":{"legend":{"asTable":true,"calcs":["lastNotNull"],"displayMode":"table","placement":"right","showLegend":true},"tooltip":{"mode":"single"}},"pluginVersion":"v11.4.0","targets":[{"datasource":{"type":"prometheus","uid":"${datasource}"},"expr":"histogram_quantile(0.99,rate(kubeproxy_sync_proxy_rules_duration_seconds_bucket{cluster=\"$cluster\",
-    job=\"kube-proxy\", instance=~\"$instance\"}[$__rate_interval]))","legendFormat":"{{instance}}"}],"title":"Rules
-    Sync Latency 99th Quantile","type":"timeseries"},{"datasource":{"type":"datasource","uid":"--
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-    job=\"kube-proxy\", instance=~\"$instance\"}[$__rate_interval])) by (instance,
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-metadata:
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-    meta.helm.sh/release-namespace: monitoring
-  labels:
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-    app.kubernetes.io/part-of: kube-prometheus-stack
-    app.kubernetes.io/version: 83.2.0
-    chart: kube-prometheus-stack-83.2.0
-    grafana_dashboard: '1'
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-    release: kube-prometheus-stack
-  name: kube-prometheus-stack-proxy
-  namespace: monitoring
-

monitoring/configmap-kube-prometheus-stack-scheduler.yaml

@@ -1,72 +0,0 @@
-apiVersion: v1
-data:
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-    sum(rate(scheduler_scheduling_algorithm_duration_seconds_bucket{cluster=\"$cluster\",
-    job=\"kube-scheduler\",instance=~\"$instance\"}[$__rate_interval])) by (cluster,
-    instance, le))","legendFormat":"{{cluster}} {{instance}} scheduling algorithm"},{"datasource":{"type":"prometheus","uid":"${datasource}"},"expr":"histogram_quantile(0.99,
-    sum(rate(scheduler_volume_scheduling_duration_seconds_bucket{cluster=\"$cluster\",
-    job=\"kube-scheduler\",instance=~\"$instance\"}[$__rate_interval])) by (cluster,
-    instance, le))","legendFormat":"{{cluster}} {{instance}} volume"}],"title":"Scheduling
-    latency 99th Quantile","type":"timeseries"},{"datasource":{"type":"datasource","uid":"--
-    Mixed --"},"fieldConfig":{"defaults":{"custom":{"fillOpacity":10,"showPoints":"never","spanNulls":true},"unit":"ops"}},"gridPos":{"h":7,"w":8,"x":0,"y":7},"id":4,"interval":"1m","options":{"legend":{"asTable":true,"calcs":["lastNotNull"],"displayMode":"table","placement":"right","showLegend":true},"tooltip":{"mode":"single"}},"pluginVersion":"v11.4.0","targets":[{"datasource":{"type":"prometheus","uid":"${datasource}"},"expr":"sum(rate(rest_client_requests_total{cluster=\"$cluster\",
-    job=\"kube-scheduler\", instance=~\"$instance\",code=~\"2..\"}[$__rate_interval]))","legendFormat":"2xx"},{"datasource":{"type":"prometheus","uid":"${datasource}"},"expr":"sum(rate(rest_client_requests_total{cluster=\"$cluster\",
-    job=\"kube-scheduler\", instance=~\"$instance\",code=~\"3..\"}[$__rate_interval]))","legendFormat":"3xx"},{"datasource":{"type":"prometheus","uid":"${datasource}"},"expr":"sum(rate(rest_client_requests_total{cluster=\"$cluster\",
-    job=\"kube-scheduler\", instance=~\"$instance\",code=~\"4..\"}[$__rate_interval]))","legendFormat":"4xx"},{"datasource":{"type":"prometheus","uid":"${datasource}"},"expr":"sum(rate(rest_client_requests_total{cluster=\"$cluster\",
-    job=\"kube-scheduler\", instance=~\"$instance\",code=~\"5..\"}[$__rate_interval]))","legendFormat":"5xx"}],"title":"Kube
-    API Request Rate","type":"timeseries"},{"datasource":{"type":"datasource","uid":"--
-    Mixed --"},"fieldConfig":{"defaults":{"custom":{"fillOpacity":10,"showPoints":"never","spanNulls":true},"unit":"ops"}},"gridPos":{"h":7,"w":16,"x":8,"y":7},"id":5,"interval":"1m","options":{"legend":{"asTable":true,"calcs":["lastNotNull"],"displayMode":"table","placement":"right","showLegend":true},"tooltip":{"mode":"single"}},"pluginVersion":"v11.4.0","targets":[{"datasource":{"type":"prometheus","uid":"${datasource}"},"expr":"histogram_quantile(0.99,
-    sum(rate(rest_client_request_duration_seconds_bucket{cluster=\"$cluster\", job=\"kube-scheduler\",
-    instance=~\"$instance\", verb=\"POST\"}[$__rate_interval])) by (verb, le))","legendFormat":"{{verb}}"}],"title":"Post
-    Request Latency 99th Quantile","type":"timeseries"},{"datasource":{"type":"datasource","uid":"--
-    Mixed --"},"fieldConfig":{"defaults":{"custom":{"fillOpacity":10,"showPoints":"never","spanNulls":true},"unit":"s"}},"gridPos":{"h":7,"w":24,"x":0,"y":14},"id":6,"interval":"1m","options":{"legend":{"asTable":true,"calcs":["lastNotNull"],"displayMode":"table","placement":"right","showLegend":true},"tooltip":{"mode":"single"}},"pluginVersion":"v11.4.0","targets":[{"datasource":{"type":"prometheus","uid":"${datasource}"},"expr":"histogram_quantile(0.99,
-    sum(rate(rest_client_request_duration_seconds_bucket{cluster=\"$cluster\", job=\"kube-scheduler\",
-    instance=~\"$instance\", verb=\"GET\"}[$__rate_interval])) by (verb, le))","legendFormat":"{{verb}}"}],"title":"Get
-    Request Latency 99th Quantile","type":"timeseries"},{"datasource":{"type":"datasource","uid":"--
-    Mixed --"},"fieldConfig":{"defaults":{"custom":{"fillOpacity":10,"showPoints":"never","spanNulls":true},"unit":"bytes"}},"gridPos":{"h":7,"w":8,"x":0,"y":21},"id":7,"interval":"1m","options":{"legend":{"asTable":true,"calcs":["lastNotNull"],"displayMode":"table","placement":"right","showLegend":true},"tooltip":{"mode":"single"}},"pluginVersion":"v11.4.0","targets":[{"datasource":{"type":"prometheus","uid":"${datasource}"},"expr":"process_resident_memory_bytes{cluster=\"$cluster\",
-    job=\"kube-scheduler\", instance=~\"$instance\"}","legendFormat":"{{instance}}"}],"title":"Memory","type":"timeseries"},{"datasource":{"type":"datasource","uid":"--
-    Mixed --"},"fieldConfig":{"defaults":{"custom":{"fillOpacity":10,"showPoints":"never","spanNulls":true},"unit":"short"}},"gridPos":{"h":7,"w":8,"x":8,"y":21},"id":8,"interval":"1m","options":{"legend":{"asTable":true,"calcs":["lastNotNull"],"displayMode":"table","placement":"right","showLegend":true},"tooltip":{"mode":"single"}},"pluginVersion":"v11.4.0","targets":[{"datasource":{"type":"prometheus","uid":"${datasource}"},"expr":"rate(process_cpu_seconds_total{cluster=\"$cluster\",
-    job=\"kube-scheduler\", instance=~\"$instance\"}[$__rate_interval])","legendFormat":"{{instance}}"}],"title":"CPU
-    usage","type":"timeseries"},{"datasource":{"type":"datasource","uid":"-- Mixed
-    --"},"fieldConfig":{"defaults":{"custom":{"fillOpacity":10,"showPoints":"never","spanNulls":true},"unit":"short"}},"gridPos":{"h":7,"w":8,"x":16,"y":21},"id":9,"interval":"1m","options":{"legend":{"asTable":true,"calcs":["lastNotNull"],"displayMode":"table","placement":"right","showLegend":true},"tooltip":{"mode":"single"}},"pluginVersion":"v11.4.0","targets":[{"datasource":{"type":"prometheus","uid":"${datasource}"},"expr":"go_goroutines{cluster=\"$cluster\",
-    job=\"kube-scheduler\",instance=~\"$instance\"}","legendFormat":"{{instance}}"}],"title":"Goroutines","type":"timeseries"}],"refresh":"10s","schemaVersion":39,"tags":["kubernetes-mixin"],"templating":{"list":[{"current":{"selected":true,"text":"default","value":"default"},"hide":0,"label":"Data
-    source","name":"datasource","query":"prometheus","regex":"","type":"datasource"},{"datasource":{"type":"prometheus","uid":"${datasource}"},"hide":2,"label":"cluster","name":"cluster","query":"label_values(up{job=\"kube-scheduler\"},
-    cluster)","refresh":2,"sort":1,"type":"query","allValue":".*"},{"allValue":".+","datasource":{"type":"prometheus","uid":"${datasource}"},"hide":0,"includeAll":true,"label":"instance","name":"instance","query":"label_values(up{job=\"kube-scheduler\",
-    cluster=\"$cluster\"}, instance)","refresh":2,"type":"query"}]},"time":{"from":"now-1h","to":"now"},"timezone":
-    "utc","title":"Kubernetes / Scheduler","uid":"2e6b6a3b4bddf1427b3a55aa1311c656"}'
-kind: ConfigMap
-metadata:
-  annotations:
-    meta.helm.sh/release-name: kube-prometheus-stack
-    meta.helm.sh/release-namespace: monitoring
-  labels:
-    app: kube-prometheus-stack-grafana
-    app.kubernetes.io/instance: kube-prometheus-stack
-    app.kubernetes.io/managed-by: Helm
-    app.kubernetes.io/part-of: kube-prometheus-stack
-    app.kubernetes.io/version: 83.2.0
-    chart: kube-prometheus-stack-83.2.0
-    grafana_dashboard: '1'
-    heritage: Helm
-    release: kube-prometheus-stack
-  name: kube-prometheus-stack-scheduler
-  namespace: monitoring
-

monitoring/values-kube-prometheus-stack.yaml

@@ -0,0 +1,60 @@
+# Valores del release Helm kube-prometheus-stack (chart 83.2.0, ns monitoring).
+#
+# Este namespace NO está bajo ArgoCD: se gestiona a mano. Hasta el 2026-07-21
+# estos valores solo vivían dentro del release, así que no había forma de saber
+# cómo estaba configurado sin interrogar a Helm. Este fichero es la fuente de
+# verdad; para aplicarlo:
+#
+#   helm upgrade kube-prometheus-stack prometheus-community/kube-prometheus-stack \
+#     --version 83.2.0 -n monitoring -f values-kube-prometheus-stack.yaml
+#
+# Revisión 2 (2026-07-21) silenció 4 alertas que llevaban meses disparadas sin
+# significar nada — ver el bloque kubeControllerManager/kubeScheduler/kubeProxy
+# y defaultRules.disabled al final.
+alertmanager:
+  enabled: false
+defaultRules:
+  create: true
+  disabled:
+    PrometheusNotConnectedToAlertmanagers: true
+  rules:
+    alertmanager: false
+grafana:
+  adminPassword: admin
+  grafana.ini:
+    server:
+      root_url: https://grafana.chemavx.xyz
+  ingress:
+    annotations:
+      cert-manager.io/cluster-issuer: letsencrypt-prod
+      traefik.ingress.kubernetes.io/router.entrypoints: websecure
+    enabled: true
+    hosts:
+    - grafana.chemavx.xyz
+    ingressClassName: traefik
+    tls:
+    - hosts:
+      - grafana.chemavx.xyz
+      secretName: grafana-tls
+  persistence:
+    enabled: true
+    size: 5Gi
+    storageClassName: local-path
+kubeControllerManager:
+  enabled: false
+kubeProxy:
+  enabled: false
+kubeScheduler:
+  enabled: false
+prometheus:
+  prometheusSpec:
+    retention: 30d
+    storageSpec:
+      volumeClaimTemplate:
+        spec:
+          accessModes:
+          - ReadWriteOnce
+          resources:
+            requests:
+              storage: 20Gi
+          storageClassName: local-path