Allow to customize the metrics port of the ServiceMonitor (#228)

fixes #221

Signed-off-by: Philipp Eckel <[email protected]>

Author: philippeckelintive

charts/backstage/Chart.yaml

@@ -38,4 +38,4 @@ sources:
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 2.0.0
+version: 2.1.0

charts/backstage/README.md

@@ -2,7 +2,7 @@
 # Backstage Helm Chart
 
 [![Artifact Hub](https://img.shields.io/endpoint?url=https://artifacthub.io/badge/repository/backstage)](https://artifacthub.io/packages/search?repo=backstage)
-![Version: 2.0.0](https://img.shields.io/badge/Version-2.0.0-informational?style=flat-square)
+![Version: 2.1.0](https://img.shields.io/badge/Version-2.1.0-informational?style=flat-square)
 ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square)
 
 A Helm chart for deploying a Backstage application
@@ -171,13 +171,14 @@ Kubernetes: `>= 1.19.0-0`
 | ingress.tls.enabled | Enable TLS configuration for the host defined at `ingress.host` parameter | bool | `false` |
 | ingress.tls.secretName | The name to which the TLS Secret will be called | string | `""` |
 | kubeVersion | Override Kubernetes version | string | `""` |
-| metrics | Metrics configuration | object | `{"serviceMonitor":{"annotations":{},"enabled":false,"interval":null,"labels":{},"path":"/metrics"}}` |
-| metrics.serviceMonitor | ServiceMonitor configuration <br /> Allows configuring your backstage instance as a scrape target for [Prometheus](https://github.com/prometheus/prometheus) using a ServiceMonitor custom resource that [Prometheus Operator](https://github.com/prometheus-operator/prometheus-operator) can understand. | object | `{"annotations":{},"enabled":false,"interval":null,"labels":{},"path":"/metrics"}` |
+| metrics | Metrics configuration | object | `{"serviceMonitor":{"annotations":{},"enabled":false,"interval":null,"labels":{},"path":"/metrics","port":"http-backend"}}` |
+| metrics.serviceMonitor | ServiceMonitor configuration <br /> Allows configuring your backstage instance as a scrape target for [Prometheus](https://github.com/prometheus/prometheus) using a ServiceMonitor custom resource that [Prometheus Operator](https://github.com/prometheus-operator/prometheus-operator) can understand. | object | `{"annotations":{},"enabled":false,"interval":null,"labels":{},"path":"/metrics","port":"http-backend"}` |
 | metrics.serviceMonitor.annotations | ServiceMonitor annotations | object | `{}` |
 | metrics.serviceMonitor.enabled | If enabled, a ServiceMonitor resource for Prometheus Operator is created <br /> Prometheus Operator must be installed in your cluster prior to enabling. | bool | `false` |
 | metrics.serviceMonitor.interval | ServiceMonitor scrape interval | string | `nil` |
 | metrics.serviceMonitor.labels | Additional ServiceMonitor labels | object | `{}` |
 | metrics.serviceMonitor.path | ServiceMonitor endpoint path <br /> Note that the /metrics endpoint is NOT present in a freshly scaffolded Backstage app. To setup, follow the [Prometheus metrics tutorial](https://github.com/backstage/backstage/blob/master/contrib/docs/tutorials/prometheus-metrics.md). | string | `"/metrics"` |
+| metrics.serviceMonitor.port | ServiceMonitor endpoint port <br /> The port where the metrics are exposed. If using OpenTelemetry as [documented here](https://backstage.io/docs/tutorials/setup-opentelemetry/), then the port needs to be explicitely specificed. OpenTelemetry's default port is 9464. | string | `"http-backend"` |
 | nameOverride | String to partially override common.names.fullname | string | `""` |
 | networkPolicy.egressRules.customRules | Additional custom egress rules | list | `[]` |
 | networkPolicy.egressRules.denyConnectionsToExternal | Deny external connections. Should not be enabled when working with an external database. | bool | `false` |

charts/backstage/templates/servicemonitor.yaml

@@ -29,7 +29,7 @@ spec:
     matchLabels: {{ include "common.labels.standard" . | nindent 6 }}
       app.kubernetes.io/component: backstage
   endpoints:
-  - port: http-backend
+  - port: {{ .Values.metrics.serviceMonitor.port }}
     path: {{ .Values.metrics.serviceMonitor.path }}
     {{- with .Values.metrics.serviceMonitor.interval }}
     interval: {{ . }}

charts/backstage/values.schema.json

@@ -6352,6 +6352,19 @@
                             "description": "ote that the /metrics endpoint is NOT present in a freshly scaffolded Backstage app. To setup, follow the Prometheus metrics tutorial. https://github.com/backstage/backstage/blob/master/contrib/docs/tutorials/prometheus-metrics.md",
                             "title": "ServiceMonitor endpoint path",
                             "type": "string"
+                        },
+                        "port": {
+                            "anyOf": [
+                                {
+                                    "type": "string"
+                                },
+                                {
+                                    "type": "integer"
+                                }
+                            ],
+                            "default": "http-backend",
+                            "description": "The port where the metrics are exposed. If using OpenTelemetry as [documented here](https://backstage.io/docs/tutorials/setup-opentelemetry/), then the port needs to be explicitely specificed. OpenTelemetry's default port is 9464.",
+                            "title": "ServiceMonitor endpoint port"
                         }
                     },
                     "title": "ServiceMonitor configuration",

charts/backstage/values.schema.tmpl.json

@@ -864,6 +864,15 @@
                             "description": "ote that the /metrics endpoint is NOT present in a freshly scaffolded Backstage app. To setup, follow the Prometheus metrics tutorial. https://github.com/backstage/backstage/blob/master/contrib/docs/tutorials/prometheus-metrics.md",
                             "type": "string",
                             "default": "/metrics"
+                        },
+                        "port": {
+                            "default": "http-backend",
+                            "description": "The port where the metrics are exposed. If using OpenTelemetry as [documented here](https://backstage.io/docs/tutorials/setup-opentelemetry/), then the port needs to be explicitely specificed. OpenTelemetry's default port is 9464.",
+                            "title": "ServiceMonitor endpoint port",
+                            "anyOf": [
+                                { "type": "string" },
+                                { "type": "integer" }
+                            ]
                         }
                     }
                 }

charts/backstage/values.yaml

@@ -460,3 +460,7 @@ metrics:
     # -- ServiceMonitor endpoint path
     # <br /> Note that the /metrics endpoint is NOT present in a freshly scaffolded Backstage app. To setup, follow the [Prometheus metrics tutorial](https://github.com/backstage/backstage/blob/master/contrib/docs/tutorials/prometheus-metrics.md).
     path: /metrics
+
+    # -- ServiceMonitor endpoint port
+    # <br /> The port where the metrics are exposed. If using OpenTelemetry as [documented here](https://backstage.io/docs/tutorials/setup-opentelemetry/), then the port needs to be explicitely specificed. OpenTelemetry's default port is 9464.
+    port: http-backend