More labels regarding docker-compose for docker_sd_configs

[rabbipigeon]

More compose meta labels for docker_sd_configs

Due to the tendancy for Loki docker plugin to hijack containers if Loki is unavailable. ive switched to promtail_sd_configs but it would be nice to have more labels such as

__meta_docker_compose_project_name
__meta_docker_compose_config_hash
...

If these would be provided, then we will have all the uses of docker plugin without the chance of it affecting containers life cycle

[jeschkies]

The "issue" is that we inherit the Docker service discovery from Prometheus and thus it's labels. So we either add them there or create some workaround here.

I like the idea though. Would you mind creating a related ticket for Prometheus?

[rabbipigeon]

@jeschkies made one here https://github.com/prometheus/prometheus/issues/10924

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