Add Alloy mixin update script and Makefile

[TheoBrigitte]

Towards: giantswarm/roadmap#3522

Towards: giantswarm/roadmap#3522

This PR is an attempt at adding some automation to fetch Alloy mixin dashboards from https://github.com/grafana/alloy/tree/main/operations/alloy-mixin/dashboards

I am unsure how scripts are organized/run in this repository and would appreciate some guidance on this.

[TheoBrigitte]

Running this script produces the following output

[TheoBrigitte]

Dashboards screenshots

broken needs to be fixed

empty since not otel receiver are configured

[QuentinBisson]

Well I actually went into a totally different direction for mimir and loki mixins which to me is way easier to use than your script https://github.com/giantswarm/dashboards/blob/main/mimir/update.sh also because I can read it and it's not using things like grizzly which I'm not sure we need

[QuentinBisson]

Now we can probably merge the 2 scripts together because i almost have the same script for loki. The interesting things about my script is that we can do some edits

[TheoBrigitte]

Well I actually went into a totally different direction for mimir and loki mixins which to me is way easier to use than your script https://github.com/giantswarm/dashboards/blob/main/mimir/update.sh also because I can read it and it's not using things like grizzly which I'm not sure we need

I changed my script to something simpler and also made use of mixtool instead of grizzly, which directly produces dashboards as json files instead grizzly CRs.

Now we can probably merge the 2 scripts together because i almost have the same script for loki. The interesting things about my script is that we can do some edits

I've kept the script separate for now, we can revisit this later on. I wanted to keep things as "simple" as possible here.

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I also made other modifications along the way

• Added Makefile.custom.mk to group scripts usage
  • Added make update-mixin to update mixin dasbhboards
  • Added make update-mimir-mixin to update Mimir mixin dashboards
  • Added make update-alloy-mixin to update Alloy mixin dashboards
  • Added make lint-dashboards to dashboards linting
  • Added make install-tools to install required tools
• Added scripts/update-alloy-mixin.sh to update the Alloy mixin dashboards