Add PrometheusRule support and tests

evgkrsk · Jun 13, 2022 · af6c699 · af6c699
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diff --git a/charts/universal-chart/CHANGELOG.md b/charts/universal-chart/CHANGELOG.md
@@ -1,4 +1,7 @@
 # Changelog
+## 3.3.0 - Jun 13, 2022
+* feat: add PrometheusRule support and tests
+
 ## 3.2.0 - May 2, 2022
 
 * feat: add HPA support and tests

diff --git a/charts/universal-chart/Chart.yaml b/charts/universal-chart/Chart.yaml
@@ -1,7 +1,7 @@
 apiVersion: v2
 description: Nixys universal Helm chart for deploy your apps to Kubernetes
 name: universal-chart
-version: 3.2.0
+version: 3.3.0
 maintainers:
 - name: Roman Andreev
   email: [email protected]

diff --git a/charts/universal-chart/README.md b/charts/universal-chart/README.md
@@ -424,25 +424,50 @@ Secret `data` object is a map where value can be a string, json or base64 encode
 
 `hpas` is map of HPA parameters, where key is a name
 
-| Name             | Description                                                             | Value                   |
-|------------------|-------------------------------------------------------------------------|-------------------------|
-| `labels`         | Extra HPA labels                                                        | `{}`                    |
-| `annotations`    | Extra HPA annotations                                                   | `{}`                    |
-| `apiVersion`     | apiVersion for HPA object                                               | `"autoscaling/v2beta1"` |
-| `minReplicas`    | minimum replicas for HPA                                                | `2`                     |
-| `maxReplicas`    | maximum replicas for HPA                                                | `3`                     |
-| `scaleTargetRef` | Required [scaleTargetRef](#hpa-scaletargetref-object-parameters) object |                         |
-| `targetCPU`      | target CPU utilization percentage                                       | `""`                    |
-| `targetMemory`   | target memory utilization percentage                                    | `""`                    |
-| `metrics`        | list of custom metrics                                                  | `[]`                        |
+| Name             | Description                                                               | Value                   |
+|------------------|---------------------------------------------------------------------------|-------------------------|
+| `labels`         | Extra HPA labels                                                          | `{}`                    |
+| `annotations`    | Extra HPA annotations                                                     | `{}`                    |
+| `apiVersion`     | apiVersion for HPA object                                                 | `"autoscaling/v2beta1"` |
+| `minReplicas`    | minimum replicas for HPA                                                  | `2`                     |
+| `maxReplicas`    | maximum replicas for HPA                                                  | `3`                     |
+| `scaleTargetRef` | (REQUIRED) [scaleTargetRef](#hpa-scaletargetref-object-parameters) object |                         |
+| `targetCPU`      | target CPU utilization percentage                                         | `""`                    |
+| `targetMemory`   | target memory utilization percentage                                      | `""`                    |
+| `metrics`        | list of custom metrics                                                    | `[]`                    |
 
 ### HPA `scaleTargetRef` object parameters
 
-| Name       | Description                      | Value        |
-|------------|----------------------------------|--------------|
-| apiVersion | apiVersion for target HPA object | "apps/v1"    |
-| kind       | kind for target HPA object       | "Deployment" |
-| name       | Required name of target object   | ""           |
+| Name         | Description                      | Value        |
+|--------------|----------------------------------|--------------|
+| `apiVersion` | apiVersion for target HPA object | "apps/v1"    |
+| `kind`       | kind for target HPA object       | "Deployment" |
+| `name`       | (REQUIRED) name of target object | ""           |
+
+### PrometheusRule parameters
+
+`prometheusrules` is map of PrometheusRule-s, where key is a name
+
+| Name     | Description                                                                                         | Value |
+|----------|-----------------------------------------------------------------------------------------------------|-------|
+| `labels` | Extra PrometheusRule labels                                                                         | `{}`  |
+| `groups` | (REQUIRED) map of [PrometheusRuleGroup](#prometheusrulegroup-object-parameters) where key is a name | `{}`  |
+
+### PrometheusRuleGroup object parameters
+
+| Name       | Description                                                  | Value |
+|------------|--------------------------------------------------------------|-------|
+| `interval` | period check for alerts                                      | `5m`  |
+| `rules`    | map of [Alert](#alert-object-parameters) where key is a name | `{}`  |
+
+### Alert object parameters
+
+| Name          | Description                  | Value |
+|---------------|------------------------------|-------|
+| `expr`        | (REQUIRED) PromQL expression | `""`  |
+| `for`         | Duration for alert           | `5m`  |
+| `labels`      | Map of rule labels           | `{}`  |
+| `annotations` | Map of rule annotations      | `{}`  |
 
 ## Configuration and installation details
 

diff --git a/charts/universal-chart/results/prometheusrules.yaml b/charts/universal-chart/results/prometheusrules.yaml
@@ -0,0 +1,25 @@
+---
+# Source: universal-chart/templates/prometheusrule.yml
+apiVersion: monitoring.coreos.com/v1
+kind: PrometheusRule
+metadata:
+  name: test-promrule
+  namespace: "default"
+  labels:
+    app.kubernetes.io/name: test
+    app.kubernetes.io/instance: test
+    app.kubernetes.io/managed-by: Helm
+    foo: bar
+spec:
+  groups:
+  - name: "job_rules"
+    interval: 1m
+    rules:
+    - alert: "RedisDown"
+      expr: redis_up == 0
+      for: 2m
+      labels:
+        severity: critical
+      annotations:
+        description: Redis instance "{{ $labels.instance }}" is down.
+        summary: Redis instance "{{ $labels.instance }}" down
diff --git a/charts/universal-chart/samples/prometheusrules.yaml b/charts/universal-chart/samples/prometheusrules.yaml
@@ -0,0 +1,16 @@
+prometheusrules:
+  promrule:
+    labels:
+      foo: bar
+    groups:
+      job_rules:
+        interval: 1m
+        rules:
+          RedisDown:
+            expr: redis_up == 0
+            for: 2m
+            labels:
+              severity: critical
+            annotations:
+              summary: Redis instance "{{ $labels.instance }}" down
+              description: Redis instance "{{ $labels.instance }}" is down.
diff --git a/charts/universal-chart/templates/prometheusrule.yml b/charts/universal-chart/templates/prometheusrule.yml
@@ -0,0 +1,31 @@
+{{- range $name, $rule := .Values.prometheusrules }}
+---
+apiVersion: monitoring.coreos.com/v1
+kind: PrometheusRule
+metadata:
+  name: {{ include "helpers.app.fullname" (dict "name" $name "context" $) }}
+  namespace: {{ $.Release.Namespace | quote }}
+  labels:
+    {{- include "helpers.app.labels" $ | nindent 4 }}
+    {{- with .labels }}{{- include "helpers.tplvalues.render" (dict "value" . "context" $) | nindent 4 }}{{- end }}
+spec:
+  groups:
+  {{- range $gname, $group := $rule.groups }}
+  - name: {{ $gname | quote }}
+    interval: {{ .interval }}
+    rules:
+      {{- range $aname, $alert := .rules }}
+    - alert: {{ $aname | quote }}
+      expr: {{ .expr }}
+      for: {{ .for }}
+      labels:
+      {{- range $key, $value := .labels }}
+        {{ $key }}: {{ $value }}
+      {{- end }}
+      annotations:
+      {{- range $key, $value := .annotations }}
+        {{ $key }}: {{ $value }}
+      {{- end }}
+    {{- end }}
+  {{- end }}
+{{- end }}
diff --git a/charts/universal-chart/testit.sh b/charts/universal-chart/testit.sh
@@ -8,7 +8,7 @@ for filename in "$dirname"/samples/*
 do
   echo "Testing $filename"
   basename=$(basename "$filename")
-  helm template test "$dirname" --values "$filename" |grep -Ev '^ +helm.sh/chart:' > "$tests"/"$basename"
+  helm --kube-context="notexisting" template test "$dirname" --values "$filename" |grep -Ev '^ +helm.sh/chart:' > "$tests"/"$basename"
   diff -u "$dirname"/results/"$basename" "$tests"/"$basename"
   echo "OK"
 done
diff --git a/charts/universal-chart/values.yaml b/charts/universal-chart/values.yaml
@@ -260,6 +260,23 @@ servicemonitors: {}
   #   labels:
   #     foo: foo
 
+prometheusrules: {}
+  # promrule:
+  #   labels:
+  #     foo: bar
+  #   groups:
+  #     job_rules:
+  #       interval: 1m
+  #       rules:
+  #         RedisDown:
+  #           expr: redis_up == 0
+  #           for: 2m
+  #           labels:
+  #             severity: critical
+  #           annotations:
+  #             summary: Redis instance "{{ $labels.instance }}" down
+  #             description: Redis instance "{{ $labels.instance }}" is down.
+
 diagnosticMode:
   enabled: false
   command: ["sleep"]