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fix(helm): improve documentation and grafana dashboard (#2992)

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### Pull Request Checklist

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https://matrix-org.github.io/dendrite/development/contributing before
submitting your pull request -->

* [x] I have added Go unit tests or [Complement integration
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_or_ I have already signed off privately

---

* **docs**: enabling of metrics in there config is needed
* **dashboard**: since the imported dashboard was created:
  * many metrics was dropped by dendrite (mainly #2967)
  * grafana has new version of diagrams ...

---------

Co-authored-by: Till <2353100+S7evinK@users.noreply.github.com>

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7
helm/dendrite/.helm-docs/monitoring.gotmpl
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@ -1,10 +1,15 @@
{{ define "chart.monitoringSection" }}
## Monitoring
[![Grafana Dashboard](https://grafana.com/api/dashboards/13916/images/9894/image)](https://grafana.com/grafana/dashboards/13916-dendrite/)
![Grafana Dashboard](grafana_dashboards/dendrite-rev2.png)
* Works well with [Prometheus Operator](https://prometheus-operator.dev/) ([Helmchart](https://artifacthub.io/packages/helm/prometheus-community/kube-prometheus-stack)) and their setup of [Grafana](https://grafana.com/grafana/), by enabling the following values:
```yaml
dendrite_config:
global:
metrics:
enabled: true
prometheus:
servicemonitor:
enabled: true

11
helm/dendrite/README.md
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@ -1,6 +1,7 @@
# dendrite
![Version: 0.12.0](https://img.shields.io/badge/Version-0.12.0-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: 0.12.0](https://img.shields.io/badge/AppVersion-0.12.0-informational?style=flat-square)
![Version: 0.12.1](https://img.shields.io/badge/Version-0.12.1-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: 0.12.0](https://img.shields.io/badge/AppVersion-0.12.0-informational?style=flat-square)
Dendrite Matrix Homeserver
Status: **NOT PRODUCTION READY**
@ -157,10 +158,15 @@ Create a folder `appservices` and place your configurations in there. The confi
## Monitoring
[![Grafana Dashboard](https://grafana.com/api/dashboards/13916/images/9894/image)](https://grafana.com/grafana/dashboards/13916-dendrite/)
![Grafana Dashboard](grafana_dashboards/dendrite-rev2.png)
* Works well with [Prometheus Operator](https://prometheus-operator.dev/) ([Helmchart](https://artifacthub.io/packages/helm/prometheus-community/kube-prometheus-stack)) and their setup of [Grafana](https://grafana.com/grafana/), by enabling the following values:
```yaml
dendrite_config:
global:
metrics:
enabled: true
prometheus:
servicemonitor:
enabled: true
@ -175,4 +181,3 @@ grafana:
enabled: true # will deploy default dashboards
```
PS: The label `release=kube-prometheus-stack` is setup with the helmchart of the Prometheus Operator. For Grafana Dashboards it may be necessary to enable scanning in the correct namespaces (or ALL), enabled by `sidecar.dashboards.searchNamespace` in [Helmchart of grafana](https://artifacthub.io/packages/helm/grafana/grafana) (which is part of PrometheusOperator, so `grafana.sidecar.dashboards.searchNamespace`)

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helm/dendrite/grafana_dashboards/dendrite-rev1.json
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{
"annotations": {
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{
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"datasource": {
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"uid": "grafana"
},
"enable": true,
"hide": true,
"iconColor": "rgba(0, 211, 255, 1)",
"name": "Annotations & Alerts",
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"matchAny": false,
"tags": [],
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},
"type": "dashboard"
}
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},
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},
"thresholdsStyle": {
"mode": "off"
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},
"mappings": [],
"min": 0,
"thresholds": {
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"steps": [
{
"color": "green",
"value": null
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{
"color": "red",
"value": 80
}
]
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"unit": "ops"
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"gridPos": {
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"x": 7,
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"id": 6,
"options": {
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"lastNotNull"
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"placement": "right",
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"sort": "none"
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},
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{
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"uid": "${DS_PROMETHEUS}"
},
"editorMode": "code",
"expr": "sum(rate(dendrite_syncapi_active_sync_requests{namespace=~\"$namespace\",service=~\"$service\"}[$__rate_interval]))by (namspace,service)",
"hide": false,
"interval": "",
"legendFormat": "active: {{namspace}} - {{service}}",
"range": true,
"refId": "A"
},
{
"datasource": {
"uid": "${DS_PROMETHEUS}"
},
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"hide": false,
"interval": "",
"legendFormat": "waiting: {{namspace}} - {{service}}",
"range": true,
"refId": "B"
}
],
"title": "Sync API",
"type": "timeseries"
},
{
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"datasource": {
"uid": "${DS_PROMETHEUS}"
},
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"panels": [],
"targets": [
{
"datasource": {
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],
"title": "Federation",
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{
"datasource": {
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{
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{
"datasource": {
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},
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"expr": "dendrite_federationapi_destination_queues_backing_off{namespace=~\"$namespace\",service=~\"$service\"}",
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"legendFormat": "Backing Off: {{namespace}}-{{service}}",
"range": true,
"refId": "C"
}
],
"title": "Federation Sender Destination",
"type": "timeseries"
}
],
"refresh": "10s",
"schemaVersion": 37,
"style": "dark",
"tags": [
"matrix",
"dendrite"
],
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{
"current": {
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"text": "Prometheus",
"value": "Prometheus"
},
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"includeAll": false,
"label": "datasource",
"multi": false,
"name": "DS_PROMETHEUS",
"options": [],
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},
{
"current": {
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"All"
],
"value": [
"$__all"
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},
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"title": "Dendrite",
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"weekStart": ""
}

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