swh-storage: Install counter metrics
Add metrics on _add endpoints
Remain one last bit to check.
Also:
- api.server: Remove timed metric on the get_storage function
Related T1598#29930
Test Plan
tox
Migrated from D1321 (view on Phabricator)
Staging instance, all changes can be removed at any time
Add metrics on _add endpoints
Remain one last bit to check.
Also:
Related T1598#29930
tox
Migrated from D1321 (view on Phabricator)