[promtail] metrics svc labels template bugfix

[mjnagel]

Fix for default label issue - bug introduced by #3083

See #3083 (comment)

Closes #3162

[mjnagel]

@zalegrala @zanhsieh this fixes the issue from my previous PR, hopefully a quick one to review/approve 😃

[jimmy-ungerman]

@zalegrala @zanhsieh this is blocking us as the current chart is in a broken state

[QuentinBisson]

@zalegrala do we need to do anything to have this released?

[zalegrala]

One more review is required @QuentinBisson. Two reviews for every PR in this repo.

[QuentinBisson]

That's good to know :)

[zalegrala]

I'm open to extending the list of maintainers if community folks are interested. Ideally there is a commit history in the repo to show why a person would be a good maintainer. :)

[zalegrala]

Did one of the other PRs handle this? I see no changes on the PR currently.

[mjnagel]

@zalegrala Looks like #3164 got merged in and covered the same changes as this PR.

[Sheikh-Abubaker]

I'm open to extending the list of maintainers if community folks are interested. Ideally there is a commit history in the repo to show why a person would be a good maintainer. :)

I am interested!!