[stable/prometheus-blackbox-exporter] Add PrometheusRule support (#21776)

Signed-off-by: Alex Snast <alexsn@fb.com>

stable/prometheus-blackbox-exporter/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 description: Prometheus Blackbox Exporter
 name: prometheus-blackbox-exporter
-version: 3.3.0
+version: 3.4.0
 appVersion: 0.15.1
 home: https://github.com/prometheus/blackbox_exporter
 sources:

stable/prometheus-blackbox-exporter/README.md

@@ -87,6 +87,10 @@ The following table lists the configurable parameters of the Blackbox-Exporter c
 | `serviceMonitor.targets.[].interval`      | See above in `serviceMonitor.defaults`                                           | `{{ serviceMonitor.defaults.interval }}`                                     |
 | `serviceMonitor.targets.[].scrapeTimeout` | See above in `serviceMonitor.defaults`                                           | `{{ serviceMonitor.defaults.scrateTimeout }}`                                |
 | `serviceMonitor.targets.[].module`        | See above in `serviceMonitor.defaults`                                           | `{{ serviceMonitor.defaults.module }}`                                       |
+| `prometheusRule.enabled`                  | Set this to true to create PrometheusRule for Prometheus operator | `false`     |
+| `prometheusRule.additionalLabels`         | Additional labels that can be passed to PrometheusRule | `{}`  |
+| `prometheusRule.namespace`                | Namespace where PrometheusRule resource should be created |      |
+| `prometheusRule.rules`                    | [PrometheusRule](https://prometheus.io/docs/prometheus/latest/configuration/alerting_rules/) to be created                      | `[]`                                                    |
 | `strategy`                                | strategy used to replace old Pods with new ones                                  | `{"rollingUpdate":{"maxSurge":1,"maxUnavailable":0},"type":"RollingUpdate"}` |
 
 Specify each parameter using the `--set key=value[,key=value]` argument to `helm install`. For example,

stable/prometheus-blackbox-exporter/templates/prometheusrule.yaml

@@ -0,0 +1,23 @@
+{{- if .Values.prometheusRule.enabled }}
+apiVersion: monitoring.coreos.com/v1
+kind: PrometheusRule
+metadata:
+  name: {{ template "prometheus-blackbox-exporter.fullname" . }}
+  {{- with .Values.prometheusRule.namespace }}
+  namespace: {{ . }}
+  {{- end }}
+  labels:
+    app.kubernetes.io/name: {{ include "prometheus-blackbox-exporter.name" $ }}
+    app.kubernetes.io/instance: {{ $.Release.Name }}
+    app.kubernetes.io/managed-by: {{ $.Release.Service }}
+    helm.sh/chart: {{ include "prometheus-blackbox-exporter.chart" $ }}
+    {{- with .Values.prometheusRule.additionalLabels }}
+    {{- toYaml . | indent 4 }}
+    {{- end }}
+spec:
+  {{- with .Values.prometheusRule.rules }}
+  groups:
+    - name: {{ template "prometheus-blackbox-exporter.name" $ }}
+      rules: {{ tpl (toYaml .) $ | nindent 8 }}
+  {{- end }}
+{{- end }}

stable/prometheus-blackbox-exporter/values.yaml

@@ -127,3 +127,11 @@ serviceMonitor:
 #      interval: 60s                    # Scraping interval. Overrides value set in `defaults`
 #      scrapeTimeout: 60s               # Scrape timeout. Overrides value set in `defaults`
 #      module: http_2xx                 # Module used for scraping. Overrides value set in `defaults`
+
+## Custom PrometheusRules to be defined
+## ref: https://github.com/coreos/prometheus-operator#customresourcedefinitions
+prometheusRule:
+  enabled: false
+  additionalLabels: {}
+  namespace: ""
+  rules: []