Adding initContainer capabilites in prometheus specs template (#21837)

Signed-off-by: Barthelemy Vessemont <barthelemy@storelift.co>

Co-authored-by: Barthelemy Vessemont <barthelemy@storelift.co>

stable/prometheus-operator/Chart.yaml

@@ -12,7 +12,7 @@ sources:
   - https://github.com/coreos/kube-prometheus
   - https://github.com/coreos/prometheus-operator
   - https://coreos.com/operators/prometheus
-version: 8.12.11
+version: 8.12.12
 appVersion: 0.37.0
 tillerVersion: ">=2.12.0"
 home: https://github.com/coreos/prometheus-operator

stable/prometheus-operator/README.md

@@ -273,6 +273,7 @@ The following tables list the configurable parameters of the prometheus-operator
 | `prometheus.prometheusSpec.apiserverConfig` | Custom `kubernetes_sd_config` https://github.com/coreos/prometheus-operator/blob/master/Documentation/api.md#apiserverconfig Default configuration will connect to current Kubernetes cluster | `{}` |
 | `prometheus.prometheusSpec.configMaps` | ConfigMaps is a list of ConfigMaps in the same namespace as the Prometheus object, which shall be mounted into the Prometheus Pods. The ConfigMaps are mounted into /etc/prometheus/configmaps/ | `[]` |
 | `prometheus.prometheusSpec.containers` | Containers allows injecting additional containers. This is meant to allow adding an authentication proxy to a Prometheus pod. |`[]`|
+| `prometheus.prometheusSpec.initContainers` | InitContainers allows injecting specialized containers that run before app containers. This is meant to pre-configure and tune mounted volume permissions. |`[]`|
 | `prometheus.prometheusSpec.disableCompaction` | If true, pass --storage.tsdb.max-block-duration=2h to prometheus. This is already done if using Thanos |`false`|
 | `prometheus.prometheusSpec.enableAdminAPI` | EnableAdminAPI enables Prometheus the administrative HTTP API which includes functionality such as deleting time series. | `false` |
 | `prometheus.prometheusSpec.enforcedNamespaceLabel` | enforces adding a namespace label of origin for each alert and metric that is user created. | `""` |

stable/prometheus-operator/templates/prometheus/prometheus.yaml

@@ -220,6 +220,10 @@ spec:
   containers:
 {{ toYaml .Values.prometheus.prometheusSpec.containers | indent 4 }}
 {{- end }}
+{{- if .Values.prometheus.prometheusSpec.initContainers }}
+  initContainers:
+{{ toYaml .Values.prometheus.prometheusSpec.initContainers | indent 4 }}
+{{- end }}
 {{- if .Values.prometheus.prometheusSpec.priorityClassName }}
   priorityClassName: {{ .Values.prometheus.prometheusSpec.priorityClassName }}
 {{- end }}

stable/prometheus-operator/values.yaml

@@ -1836,6 +1836,10 @@ prometheus:
     ##  if using proxy extraContainer  update targetPort with proxy container port
     containers: []
 
+    ## InitContainers allows injecting additional initContainers. This is meant to allow doing some changes
+    ## (permissions, dir tree) on mounted volumes before starting prometheus
+    initContainers: []
+
     ## Enable additional scrape configs that are managed externally to this chart. Note that the prometheus
     ## will fail to provision if the correct secret does not exist.
     ## This option requires that you are maintaining a secret in the same namespace as Prometheus with