Enable Loki compactor retention and rotation

[moelsayed]

What this PR does / why we need it:
Our current configuration doesn't enable Loki compactor. This PR enables the compactor by default to rotate old file and avoid running out of disk space.
Which issue(s) this PR fixes:

Fixes #

What type of PR is this?
/kind feature

Special notes for your reviewer:

Does this PR introduce a user-facing change? Then add your Release Note here:

Enable Loki Compactor rotation and set retention to 1 month by default. 

Documentation:

NONE

[embik]

Nit: can we document the new default retention period in the release note and maybe even how to override it?

[dharapvj]

👏 👏 👏

[dharapvj]

Do we still need to delete old files from some directory ... even after turning on compactor? @moelsayed - i kind of remember we did this when we were working through this? In that case - may be add that bit in release notes as well.

[wurbanski]

and maybe even how to override it?

well, we don't document any other features of Loki that the end user might want to customize using the chart to be fair :P
we're using an upstream loki chart which is a bit outdated at this moment so we might want to work on that later anyway...

edit: agree on adding a release note, though

[wurbanski]

/lgtm

(please extend the release note in the description, it will be applied to the release note even if you do it later @moelsayed)

[kubermatic-bot]

LGTM label has been added.

Git tree hash: 5cf7927d3328d8006a4b38e2db3f346638814f15

[moelsayed]

@dharapvj No need to remove files to enable this. We did that while working on it because we had ran out of space and Loki was failing to start. Normally that should be the case.

[wurbanski]

/approve

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: moelsayed, wurbanski

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