mirror of
https://github.com/TryGhost/Ghost.git
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8b26b52513
ref
https://linear.app/tryghost/issue/ENG-1591/add-prometheus-and-grafana-services-to-docker-compose
This commit adds 2 new services to the docker compose file to enable
monitoring metrics from Ghost locally in real-time:
1. Prometheus - a service that scrapes Ghost's new `/metrics` endpoint
introduced in this
[commit](768336efad).
2. Grafana - a service that consumes the metrics from prometheus and
exposes them in a dashboard that you can view locally at
`localhost:3000`.
# Usage
Both of these services are selectively enabled using docker compose
[profiles](https://docs.docker.com/compose/how-tos/profiles/). This way,
if you don't opt-in to using these monitoring tools, they won't start
and consume resources on your host machine. To enable these services,
enable the `monitoring` profile by either setting the `COMPOSE_PROFILES`
environment variable to `monitoring`, or specifying the `--profile
monitoring` CLI argument to any `docker compose ...` commands.
I've found the easiest way to configure this in an 'always on' fashion
is to create a `.env` file in the project's root directory and add
`COMPOSE_PROFILES=monitoring` to it. As an added convenience, you can
also set `COMPOSE_FILE=.github/scripts/docker-compose.yml`, which will
allow you to run `docker compose ...` commands from the root directory
without specifying the full path each time.
# Intended for development only
These services are meant for local development only, and are not
configured for a production use-case. For example, the Grafana instance
is configured to have _no authorization_ so you won't need a
username/password to login at `localhost:3000`. Prometheus is also
configured to scrape the metrics once every second, which is likely
excessive for production use-cases, but may be useful for getting more
granular metrics while e.g. load testing locally.
# Dashboards
The Grafana instance includes a default dashboard including most of the
main default metrics provided by our prometheus client integration. The
dashboard is defined in a JSON file at
`.github/scripts/docker/grafana/dashboards/main-dashboard.json' and can
be modified & committed to add new visualizations that will be available
to anyone work on Ghost locally. You can also add other dashboards to
the same directory for specific use-cases, which should be picked up and
made available in the Grafana UI. [Read
more](https://grafana.com/docs/grafana/latest/dashboards/build-dashboards/view-dashboard-json-model/)
about Grafana's JSON schema for dashboards.
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{
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"__inputs": [],
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"__requires": [
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{
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"id": "grafana",
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"name": "Grafana",
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|
"type": "grafana",
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"version": "7.4.3"
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},
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{
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"id": "graph",
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"name": "Graph",
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"type": "panel",
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"version": ""
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},
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{
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"id": "prometheus",
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"name": "Prometheus",
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"type": "datasource",
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"version": "1.0.0"
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}
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],
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"annotations": {
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"list": [
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{
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"builtIn": 1,
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"datasource": "-- Grafana --",
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"enable": true,
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"hide": true,
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"iconColor": "rgba(0, 211, 255, 1)",
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"name": "Annotations & Alerts",
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|
"type": "dashboard"
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},
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{
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|
"datasource": "$datasource",
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"enable": true,
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"expr": "ghost_process_start_time_seconds{job=~\"$job\", instance=~\"$instance\"} * 1000",
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"hide": false,
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"iconColor": "#B877D9",
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"name": "Ghost Start",
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"showIn": 0,
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"textFormat": "{{instance}}",
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"titleFormat": "Ghost Start",
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"useValueForTime": true
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}
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]
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},
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"description": "An overview of the Ghost process metrics.",
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"editable": true,
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"gnetId": 14058,
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"graphTooltip": 0,
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"id": 1,
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"iteration": 1608497517213,
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"links": [],
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"panels": [
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"datasource": null,
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"gridPos": {
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"h": 1,
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"w": 24,
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"x": 0,
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"y": 0
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},
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"id": 1,
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"title": "Overview",
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"type": "row"
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},
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{
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"cacheTimeout": null,
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"colorBackground": false,
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"colorValue": false,
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"colors": [
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"#299c46",
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"rgba(237, 129, 40, 0.89)",
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"#d44a3a"
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],
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"datasource": "$datasource",
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"description": "The version of Node.js.",
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"fieldConfig": {
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"defaults": {
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"custom": {}
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"overrides": []
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"format": "none",
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"maxValue": 100,
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"minValue": 0,
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"name": "value to text",
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"value": 1
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{
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"name": "range to text",
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"value": 2
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}
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],
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"maxDataPoints": 100,
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"nullPointMode": "connected",
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"nullText": null,
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"pluginVersion": "6.6.2",
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"postfix": "",
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"postfixFontSize": "50%",
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"prefix": "",
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"prefixFontSize": "50%",
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"rangeMaps": [
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{
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"from": "null",
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"text": "N/A",
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"to": "null"
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"sparkline": {
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"fillColor": "rgba(31, 118, 189, 0.18)",
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"ymax": null,
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"ymin": null
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},
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"tableColumn": "version",
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"targets": [
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{
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"expr": "ghost_nodejs_version_info",
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"format": "table",
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"instant": true,
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"legendFormat": "",
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"refId": "A"
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}
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],
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"thresholds": "",
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"timeShift": null,
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"title": "Node.js Version",
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"type": "singlestat",
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"valueFontSize": "80%",
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"valueMaps": [
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{
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"op": "=",
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"text": "N/A",
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"value": "null"
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}
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],
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"valueName": "first"
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{
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"rgba(237, 129, 40, 0.89)",
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"#d44a3a"
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],
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"datasource": "$datasource",
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"description": "The number of times Node.js restarted.",
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"fieldConfig": {
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"defaults": {
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"custom": {}
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},
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"overrides": []
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"ymin": null
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},
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"tableColumn": "",
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"targets": [
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{
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"expr": "sum(changes(ghost_process_start_time_seconds{job=~\"$job\", instance=~\"$instance\", hostname=~\"$hostname\"}[$__range]))",
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"instant": false,
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"legendFormat": "Node.js",
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"timeShift": null,
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"title": "Node.js Restarts",
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"id": 4,
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"panels": [],
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"title": "Process",
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"type": "row"
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},
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{
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{
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{
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{
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"legendFormat": "Total CPU - {{instance}}",
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}
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],
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|
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|
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{
|
|
"expr": "process_resident_memory_bytes{job=~\"$job\", instance=~\"$instance\"}",
|
|
"interval": "",
|
|
"legendFormat": "Process Memory - {{instance}}",
|
|
"refId": "A"
|
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},
|
|
{
|
|
"expr": "ghost_nodejs_heap_size_total_bytes{job=~\"$job\", instance=~\"$instance\"}",
|
|
"interval": "",
|
|
"legendFormat": "Heap Total - {{instance}}",
|
|
"refId": "B"
|
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},
|
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{
|
|
"expr": "ghost_nodejs_heap_size_used_bytes{job=~\"$job\", instance=~\"$instance\"}",
|
|
"interval": "",
|
|
"legendFormat": "Heap Used - {{instance}}",
|
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"refId": "C"
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