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expose frigate_camera_events as a gauge

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The metric reports the current count of events in the database, which drops when retention prunes old events. As a counter, each prune read as a counter reset, so increase() and rate() inflated event counts. The series name changes from frigate_camera_events_total to frigate_camera_events. The test's porch/inside assertion was missing its `in event.text` and always passed.
This commit is contained in:
Josh Hawkins
2026-10-22 15:18:47 -05:00
parent 8fa8761a44
commit d30772645d
3 changed files with 15 additions and 20 deletions
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docs/docs/configuration/metrics.md
+4 -5
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@@ -69,7 +69,7 @@ These gauges report the operating system's figures for the whole filesystem (the
### Event Metrics
- `frigate_camera_events{camera="", label=""}` - Count of camera events since exporter started
- `frigate_camera_events{camera="", label=""}` - Current number of events stored in the database for each camera and label
## Configuring Prometheus
@@ -101,8 +101,8 @@ rate(frigate_detection_fps{camera_name="front_door"}[5m])
# Storage usage percentage
(frigate_storage_used_bytes / frigate_storage_total_bytes) * 100
# Event count by camera in last hour
increase(frigate_camera_events[1h])
# Number of events currently stored in the database by camera
sum by (camera) (frigate_camera_events)
```
## Grafana Dashboard
@@ -121,8 +121,7 @@ A sample Grafana dashboard JSON will be provided in a future update.
The metrics exposed by Frigate use the following Prometheus metric types:
- **Counter**: Cumulative values that only increase (e.g., `frigate_camera_events`)
- **Gauge**: Values that can go up and down (e.g., `frigate_cpu_usage_percent`)
- **Gauge**: Values that can go up and down (e.g., `frigate_cpu_usage_percent`, `frigate_camera_events`)
- **Info**: Key-value pairs for metadata (e.g., `frigate_storage_mount_type`)
For more information about Prometheus metric types, see the [Prometheus documentation](https://prometheus.io/docs/concepts/metric_types/).