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feat: add Prometheus metrics (#439)

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* feat: add Prometheus metrics

* setup metrics using Prometheus client under /metrics endpoint
* add configuration value for metrics
* configure Prometheus middleware for generic metrics
* provide metrics for totals of users, gists and SSH keys
* modify test request to optionally return the response
* provide integration test for Prometheus metrics
* update documentation

* chore: make fmt
This commit is contained in:
Philipp Eckel
2025-03-17 14:30:38 +01:00
committed by GitHub
parent 8c7e941182
commit 1ec026e191
13 changed files with 328 additions and 21 deletions
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1
docs/.vitepress/config.mts
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@ -46,6 +46,7 @@ export default defineConfig({
{text: 'Custom assets', link: '/custom-assets'},
{text: 'Custom links', link: '/custom-links'},
{text: 'Cheat Sheet', link: '/cheat-sheet'},
{text: 'Metrics', link: '/metrics'},
{text: 'Admin panel', link: '/admin-panel'},
], collapsed: false
},

1
docs/configuration/cheat-sheet.md
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@ -19,6 +19,7 @@ aside: false
| http.host | OG_HTTP_HOST | `0.0.0.0` | The host on which the HTTP server should bind. |
| http.port | OG_HTTP_PORT | `6157` | The port on which the HTTP server should listen. |
| http.git-enabled | OG_HTTP_GIT_ENABLED | `true` | Enable or disable git operations (clone, pull, push) via HTTP. (`true` or `false`) |
| metrics.enabled | OG_METRICS_ENABLED | `false` | Enable or disable Prometheus metrics endpoint at `/metrics` (`true` or `false`) |
| ssh.git-enabled | OG_SSH_GIT_ENABLED | `true` | Enable or disable git operations (clone, pull, push) via SSH. (`true` or `false`) |
| ssh.host | OG_SSH_HOST | `0.0.0.0` | The host on which the SSH server should bind. |
| ssh.port | OG_SSH_PORT | `2222` | The port on which the SSH server should listen. |

49
docs/configuration/metrics.md Normal file
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@ -0,0 +1,49 @@
# Metrics
Opengist offers built-in support for Prometheus metrics to help you monitor the performance and usage of your instance. These metrics provide insights into application health, user activity, and database statistics.
## Enabling metrics
By default, the metrics endpoint is disabled for security and performance reasons. To enable it, update your configuration as stated in the [configuration cheat sheet](cheat-sheet.md):
```yaml
metrics.enabled = true
```
Alternatively, you can use the environment variable:
```bash
OG_METRICS_ENABLED=true
```
Once enabled, metrics are available at the /metrics endpoint.
## Available metrics
### Opengist-specific metrics
| Metric Name | Type | Description |
|-------------|------|-------------|
| `opengist_users_total` | Gauge | Total number of registered users |
| `opengist_gists_total` | Gauge | Total number of gists in the system |
| `opengist_ssh_keys_total` | Gauge | Total number of SSH keys added by users |
### Standard HTTP metrics
In addition to the Opengist-specific metrics, standard Prometheus HTTP metrics are also available through the Echo Prometheus middleware. These include request durations, request counts, and request/response sizes.
These standard metrics follow the Prometheus naming convention and include labels for HTTP method, status code, and handler path.
## Security Considerations
The metrics endpoint exposes information about your Opengist instance that might be sensitive in some environments. Consider using a reverse proxy with authentication for the `/metrics` endpoint if your Opengist instance is publicly accessible.
Example with Nginx:
```shell
location /metrics {
auth_basic "Metrics";
auth_basic_user_file /etc/nginx/.htpasswd;
proxy_pass http://localhost:6157/metrics;
}
```