swh/webapp: Add webapp metrics scraping configuration

Limit the scraping to 1 pod as the metrics are the same for all pods

Related to swh/infra/sysadm-environment#5227

swh/templates/_helper_ingress.tpl

@@ -20,6 +20,9 @@ kind: Ingress
 metadata:
   namespace: {{ $.Values.namespace }}
   name: {{ $serviceType }}-ingress-{{ $endpoint_definition }}
+  labels:
+    app: {{ $serviceType }}
+    endpoint-definition: {{ $endpoint_definition }}
   annotations:
   {{- if or (not (hasKey $configuration.ingress "useEndpointsAsUpstream")) (eq $configuration.ingress.useEndpointsAsUpstream false) -}}
   {{- /* undocumented swh's ingress option to configure the upstreams to use the service ip.

swh/templates/_helper_service.tpl

@@ -8,6 +8,8 @@ kind: Service
 metadata:
   name: {{ .serviceType }}
   namespace: {{ .Values.namespace }}
+  labels:
+    app: {{ .serviceType }}
 spec:
   type: ClusterIP
   selector:

swh/templates/web/monitoring.yaml

+{{ if .Values.web.enabled -}}
+{{ range $web_type, $web_config := .Values.web.deployments }}
+{{- /*  metricsScrapingEnabled defaults to true if not defined  */ -}}
+{{- if and (or (not (hasKey $web_config "enabled")) (get $web_config "enabled"))
+           (or (not (hasKey $web_config "metricsScrapingEnabled")) $web_config.metricsScrapingEnabled) -}}
+---
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: web-{{ $web_type }}-metrics
+  namespace: {{ $.Values.namespace }}
+spec:
+  endpoints:
+  - path: /metrics/prometheus/
+    port: rpc
+    interval: 300s
+    scrapeTimeout: 60s
+  selector:
+    matchLabels:
+      app: web-{{ $web_type }}
+  namespaceSelector:
+    matchNames:
+      - {{ $.Values.namespace }}
+{{- end -}}
+{{ end -}}
+{{- end -}}

swh/values/production/swh-cassandra.yaml

@@ -288,6 +288,7 @@ web:
   logLevel: INFO
   deployments:
     cassandra:
+      metricsScrapingEnabled: false
       requestedCpu: 500m
       requestedMemory: 500Mi
       autoScaling:

swh/values/production/swh.yaml

@@ -1366,6 +1366,7 @@ web:
           site_id: 59
     # Test instance
     app1:
+      metricsScrapingEnabled: false
       requestedCpu: 500m
       requestedMemory: 1024Mi
       refreshSavecodenowStatus:

swh/values/staging/overrides/swh-cassandra-next-version.yaml

@@ -262,6 +262,7 @@ postgresqlWebConfiguration:
 web:
   deployments:
     cassandra:
+      metricsScrapingEnabled: false
       replicas: 1
       autoScaling:
         minReplicaCount: 1

swh/values/staging/swh.yaml

@@ -785,6 +785,7 @@ web:
   logLevel: INFO
   deployments:
     postgresql:
+      metricsScrapingEnabled: false
       # small footprint because this webapp is almost not used, only for tests
       replicas: 1
       requestedCpu: 50m