feat(matrix): wire Synapse into monitoring stack

- New headless Service matrix-synapse-metrics exposing port 9090
  (Synapse's /_synapse/metrics listener), labeled matrix_metrics=enabled
- VictoriaMetrics scrape job 'matrix' targets endpoints in matrix ns
  with that label + port name 'metrics'
- Grafana picks up the official Synapse dashboard from
  element-hq/synapse v1.152.0 contrib/grafana/synapse.json via URL

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

prototypes/grafana/helm/grafana.ytt.yaml

@@ -64,6 +64,9 @@ dashboards:
       gnetId: 15757
       revision: 37
       datasource: VictoriaMetrics
+    matrix-synapse:
+      url: https://raw.githubusercontent.com/element-hq/synapse/v1.152.0/contrib/grafana/synapse.json
+      datasource: VictoriaMetrics
     ocis:
       datasource: VictoriaMetrics
       json: |-

prototypes/matrix-synapse/ytt/metrics-service.ytt.yaml

@@ -0,0 +1,24 @@
+#@ load("@ytt:data", "data")
+
+#@ ns = data.values.application.namespace
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: matrix-synapse-metrics
+  namespace: #@ ns
+  labels:
+    matrix_metrics: enabled
+spec:
+  type: ClusterIP
+  clusterIP: None
+  selector:
+    app.kubernetes.io/component: synapse
+    app.kubernetes.io/instance: matrix-synapse
+    app.kubernetes.io/name: matrix-synapse
+  ports:
+    - name: metrics
+      port: 9090
+      targetPort: metrics
+      protocol: TCP

prototypes/victoria-metrics-single/helm/victoria-metrics-single.ytt.yaml

@@ -94,3 +94,17 @@ server:
               target_label: ocis_service
             - source_labels: [__meta_kubernetes_pod_name]
               target_label: pod
+        - job_name: synapse
+          metrics_path: /_synapse/metrics
+          kubernetes_sd_configs:
+            - role: endpoints
+              namespaces:
+                names: [matrix]
+          relabel_configs:
+            - source_labels: [__meta_kubernetes_service_label_matrix_metrics, __meta_kubernetes_endpoint_port_name]
+              action: keep
+              regex: enabled;metrics
+            - source_labels: [__meta_kubernetes_pod_name]
+              target_label: pod
+            - target_label: index
+              replacement: "0"

rendered/envs/minikube/grafana/configmap-grafana.yaml

@@ -19,7 +19,7 @@ data:
       name: VictoriaMetrics
       type: prometheus
       url: http://victoria-metrics-single-server.monitoring.svc:8428
-  download_dashboards.sh: "#!/usr/bin/env sh\nset -euf\nmkdir -p /var/lib/grafana/dashboards/default\n\ncurl -skf \\\n--connect-timeout 60 \\\n--max-time 60 \\\n-H \"Accept: application/json\" \\\n-H \"Content-Type: application/json;charset=UTF-8\" \\\n  \"https://grafana.com/api/dashboards/15757/revisions/37/download\" \\\n  | sed '/-- .* --/! s/\"datasource\":.*,/\"datasource\": \"VictoriaMetrics\",/g' \\\n> \"/var/lib/grafana/dashboards/default/kubernetes-cluster.json\"\n  \ncurl -skf \\\n--connect-timeout 60 \\\n--max-time 60 \\\n-H \"Accept: application/json\" \\\n-H \"Content-Type: application/json;charset=UTF-8\" \\\n  \"https://grafana.com/api/dashboards/1860/revisions/37/download\" \\\n  | sed '/-- .* --/! s/\"datasource\":.*,/\"datasource\": \"VictoriaMetrics\",/g' \\\n> \"/var/lib/grafana/dashboards/default/node-exporter.json\"\n"
+  download_dashboards.sh: "#!/usr/bin/env sh\nset -euf\nmkdir -p /var/lib/grafana/dashboards/default\n\ncurl -skf \\\n--connect-timeout 60 \\\n--max-time 60 \\\n-H \"Accept: application/json\" \\\n-H \"Content-Type: application/json;charset=UTF-8\" \\\n  \"https://grafana.com/api/dashboards/15757/revisions/37/download\" \\\n  | sed '/-- .* --/! s/\"datasource\":.*,/\"datasource\": \"VictoriaMetrics\",/g' \\\n> \"/var/lib/grafana/dashboards/default/kubernetes-cluster.json\"\n  \ncurl -skf \\\n--connect-timeout 60 \\\n--max-time 60 \\\n-H \"Accept: application/json\" \\\n-H \"Content-Type: application/json;charset=UTF-8\" \\\n  \"https://raw.githubusercontent.com/element-hq/synapse/v1.152.0/contrib/grafana/synapse.json\" \\\n  | sed '/-- .* --/! s/\"datasource\":.*,/\"datasource\": \"VictoriaMetrics\",/g' \\\n> \"/var/lib/grafana/dashboards/default/matrix-synapse.json\"\n  \ncurl -skf \\\n--connect-timeout 60 \\\n--max-time 60 \\\n-H \"Accept: application/json\" \\\n-H \"Content-Type: application/json;charset=UTF-8\" \\\n  \"https://grafana.com/api/dashboards/1860/revisions/37/download\" \\\n  | sed '/-- .* --/! s/\"datasource\":.*,/\"datasource\": \"VictoriaMetrics\",/g' \\\n> \"/var/lib/grafana/dashboards/default/node-exporter.json\"\n"
   grafana.ini: |
     [analytics]
     check_for_updates = true

rendered/envs/minikube/grafana/deployment-grafana.yaml

@@ -22,7 +22,7 @@ spec:
   template:
     metadata:
       annotations:
-        checksum/config: f0cad22500d4e1577b09e33968d5ed873452b63eee6d4fedf9db55f640704755
+        checksum/config: 5be4357fd6e211fab2024add34069a0a3555e629a11081fb4461a2c09fdeff49
         checksum/dashboards-json-config: 02278b031cbf8831bf02b7a4256e61be096aaeb31d9a25dabd282b6933b1abcb
         checksum/sc-dashboard-provider-config: e70bf6a851099d385178a76de9757bb0bef8299da6d8443602590e44f05fdf24
         kubectl.kubernetes.io/default-container: grafana

rendered/envs/minikube/matrix-synapse/service-matrix-synapse-metrics.yaml

@@ -0,0 +1,21 @@
+apiVersion: v1
+kind: Service
+metadata:
+  annotations:
+    a8r.io/repository: ssh://git@git.tr1ceracop.de:222/gitea_admin/k8s-and-chill.git
+  labels:
+    matrix_metrics: enabled
+  name: matrix-synapse-metrics
+  namespace: matrix
+spec:
+  clusterIP: None
+  ports:
+    - name: metrics
+      port: 9090
+      protocol: TCP
+      targetPort: metrics
+  selector:
+    app.kubernetes.io/component: synapse
+    app.kubernetes.io/instance: matrix-synapse
+    app.kubernetes.io/name: matrix-synapse
+  type: ClusterIP

rendered/envs/minikube/victoria-metrics-single/configmap-victoria-metrics-single-server-scrapeconfig.yaml

@@ -101,6 +101,24 @@ data:
       - source_labels:
         - __meta_kubernetes_pod_name
         target_label: pod
+    - job_name: synapse
+      kubernetes_sd_configs:
+      - namespaces:
+          names:
+          - matrix
+        role: endpoints
+      metrics_path: /_synapse/metrics
+      relabel_configs:
+      - action: keep
+        regex: enabled;metrics
+        source_labels:
+        - __meta_kubernetes_service_label_matrix_metrics
+        - __meta_kubernetes_endpoint_port_name
+      - source_labels:
+        - __meta_kubernetes_pod_name
+        target_label: pod
+      - replacement: "0"
+        target_label: index
 kind: ConfigMap
 metadata:
   annotations:

rendered/envs/production/grafana/configmap-grafana.yaml

@@ -19,7 +19,7 @@ data:
       name: VictoriaMetrics
       type: prometheus
       url: http://victoria-metrics-single-server.monitoring.svc:8428
-  download_dashboards.sh: "#!/usr/bin/env sh\nset -euf\nmkdir -p /var/lib/grafana/dashboards/default\n\ncurl -skf \\\n--connect-timeout 60 \\\n--max-time 60 \\\n-H \"Accept: application/json\" \\\n-H \"Content-Type: application/json;charset=UTF-8\" \\\n  \"https://grafana.com/api/dashboards/15757/revisions/37/download\" \\\n  | sed '/-- .* --/! s/\"datasource\":.*,/\"datasource\": \"VictoriaMetrics\",/g' \\\n> \"/var/lib/grafana/dashboards/default/kubernetes-cluster.json\"\n  \ncurl -skf \\\n--connect-timeout 60 \\\n--max-time 60 \\\n-H \"Accept: application/json\" \\\n-H \"Content-Type: application/json;charset=UTF-8\" \\\n  \"https://grafana.com/api/dashboards/1860/revisions/37/download\" \\\n  | sed '/-- .* --/! s/\"datasource\":.*,/\"datasource\": \"VictoriaMetrics\",/g' \\\n> \"/var/lib/grafana/dashboards/default/node-exporter.json\"\n"
+  download_dashboards.sh: "#!/usr/bin/env sh\nset -euf\nmkdir -p /var/lib/grafana/dashboards/default\n\ncurl -skf \\\n--connect-timeout 60 \\\n--max-time 60 \\\n-H \"Accept: application/json\" \\\n-H \"Content-Type: application/json;charset=UTF-8\" \\\n  \"https://grafana.com/api/dashboards/15757/revisions/37/download\" \\\n  | sed '/-- .* --/! s/\"datasource\":.*,/\"datasource\": \"VictoriaMetrics\",/g' \\\n> \"/var/lib/grafana/dashboards/default/kubernetes-cluster.json\"\n  \ncurl -skf \\\n--connect-timeout 60 \\\n--max-time 60 \\\n-H \"Accept: application/json\" \\\n-H \"Content-Type: application/json;charset=UTF-8\" \\\n  \"https://raw.githubusercontent.com/element-hq/synapse/v1.152.0/contrib/grafana/synapse.json\" \\\n  | sed '/-- .* --/! s/\"datasource\":.*,/\"datasource\": \"VictoriaMetrics\",/g' \\\n> \"/var/lib/grafana/dashboards/default/matrix-synapse.json\"\n  \ncurl -skf \\\n--connect-timeout 60 \\\n--max-time 60 \\\n-H \"Accept: application/json\" \\\n-H \"Content-Type: application/json;charset=UTF-8\" \\\n  \"https://grafana.com/api/dashboards/1860/revisions/37/download\" \\\n  | sed '/-- .* --/! s/\"datasource\":.*,/\"datasource\": \"VictoriaMetrics\",/g' \\\n> \"/var/lib/grafana/dashboards/default/node-exporter.json\"\n"
   grafana.ini: |
     [analytics]
     check_for_updates = true

rendered/envs/production/grafana/deployment-grafana.yaml

@@ -22,7 +22,7 @@ spec:
   template:
     metadata:
       annotations:
-        checksum/config: de8d6f16e9721409f5848bcc101e6aa9815e6455bd4fb9b59306159e705ac1cb
+        checksum/config: 3091c3340f9e9518f161b4ddf15db275c8757370b7e8c8d7af912dd555ca3ff6
         checksum/dashboards-json-config: 02278b031cbf8831bf02b7a4256e61be096aaeb31d9a25dabd282b6933b1abcb
         checksum/sc-dashboard-provider-config: e70bf6a851099d385178a76de9757bb0bef8299da6d8443602590e44f05fdf24
         kubectl.kubernetes.io/default-container: grafana

rendered/envs/production/matrix-synapse/service-matrix-synapse-metrics.yaml

@@ -0,0 +1,21 @@
+apiVersion: v1
+kind: Service
+metadata:
+  annotations:
+    a8r.io/repository: ssh://git@git.tr1ceracop.de:222/gitea_admin/k8s-and-chill.git
+  labels:
+    matrix_metrics: enabled
+  name: matrix-synapse-metrics
+  namespace: matrix
+spec:
+  clusterIP: None
+  ports:
+    - name: metrics
+      port: 9090
+      protocol: TCP
+      targetPort: metrics
+  selector:
+    app.kubernetes.io/component: synapse
+    app.kubernetes.io/instance: matrix-synapse
+    app.kubernetes.io/name: matrix-synapse
+  type: ClusterIP

rendered/envs/production/victoria-metrics-single/configmap-victoria-metrics-single-server-scrapeconfig.yaml

@@ -101,6 +101,24 @@ data:
       - source_labels:
         - __meta_kubernetes_pod_name
         target_label: pod
+    - job_name: synapse
+      kubernetes_sd_configs:
+      - namespaces:
+          names:
+          - matrix
+        role: endpoints
+      metrics_path: /_synapse/metrics
+      relabel_configs:
+      - action: keep
+        regex: enabled;metrics
+        source_labels:
+        - __meta_kubernetes_service_label_matrix_metrics
+        - __meta_kubernetes_endpoint_port_name
+      - source_labels:
+        - __meta_kubernetes_pod_name
+        target_label: pod
+      - replacement: "0"
+        target_label: index
 kind: ConfigMap
 metadata:
   annotations: