Synapse Worker Metrics exposed at wrong path since Traefik migration

[davidmehren]

Describe the bug
The documentation states:

the playbook will also automatically expose all Synapse worker threads' metrics to https://matrix.DOMAIN/metrics/synapse/worker/ID, where ID corresponds to the worker id

But since the migration to Traefik this does not seem to be the case anymore.
The worker containers have labels like
"traefik.http.routers.matrix-synapse-worker-generic-0-metrics.rule": "Host(`matrix.kif.rocks`) && Path(`/metrics/synapse/generic-worker-0`)", which misses the worker subpath.

To Reproduce
My vars.yml file looks like this:

# A bunch of stuff omitted, the relevant settings are:

matrix_synapse_metrics_enabled: true
matrix_synapse_metrics_proxying_enabled: true
matrix_metrics_exposure_enabled: true

matrix_metrics_exposure_http_basic_auth_enabled: true
matrix_metrics_exposure_http_basic_auth_users: <redacted>

Expected behavior
Metrics should be available at the documented place or the documentation should be adjusted and the change announced.

Matrix Server:

• OS: Debian 12
• Architecture: amd64

[spantaleev]

Indeed, it seems to have gotten lost in translation! Thanks for reporting it!