Prometheus have built-in discovery of Docker containers with docker_sd_configs, see https://prometheus.io/docs/prometheus/latest/configuration/configuration/#docker_sd_config.
See examples/vanilla for a working example.
The trouble with docker_sd_configs is when a container have multiple exposed ports, there will be multiple targets present for the same container. This application solves that scenario.
See examples/discovery for a working example.
For a container to be exported:
- add container label 'prometheus_job' with the job name you want as value.
- the container must be in the configured target network (defaults to 'metrics-net').
- the container must have at least 1 expose port. Public ports are ignored. This may already be set in the Docker image.
| Container label | Description |
|---|---|
| prometheus_job | Add target. Set job name to value. Containers without this label will be ignored. |
| prometheus_<key> | Add <key>' to output labels |
| prometheus_scrape_port | Overrules address scrape port. Should be set when the container have multiple exposed ports. |
| prometheus_scrape_interval | Override the scrape interval. Optional. |
| prometheus_scrape_timeout | Override the scrape timeout. Optional. |
| prometheus_scrape_path | Override metrics path. Optional. |
| prometheus_scrape_scheme | Override scheme. Optional. |
Metrics should indicate if a container has the 'prometheus_job' label set, but not included in targets.