Support multiple instances and extra labels for service monitor

[ryan-dyer-sp]

Fix for : #170

Add instance label in order to distinguish between one chart and another deployed into same namespace

[lightbend-cla-validator]

Hi @ryan-dyer,

Thank you for your contribution! We really value the time you've taken to put this together.

Before we proceed with reviewing this pull request, please sign the Lightbend Contributors License Agreement:

https://www.lightbend.com/contribute/cla

[seglo]

@ryan-dyer LGTM, but the CLA needs to be signed before I can merge the PR.

[lightbend-cla-validator]

Hi @ryan-dyer,

Thank you for your contribution! We really value the time you've taken to put this together.

Before we proceed with reviewing this pull request, please sign the Lightbend Contributors License Agreement:

https://www.lightbend.com/contribute/cla

[ryan-dyer-sp]

@seglo I've signed this like 3 times now. I'm told
"Thank you! Your submission was processed."

[seglo]

@ryan-dyer-sp It's probably because your commit identity doesn't match your GitHub id. If you sign with the other id, or rebase your commits with the signed id, then it should work. Might need to create a new PR though.

[ryan-dyer-sp]

That was it. Thanks!