Switch Cluster/Template/Gitopsset etc querying to the explorer querier

[foot]

Current querying system of many EE resources is SLOW, explorer is backed by sqlite/db cache and is very fast! Lets try and use this fast system.

The current endpoints:

• /v1/clusters
• /v1/templates
• /v1/gitopssets
• etc

Are all using the older "slower" (create restmapper etc each request), system, can we take advantage of the new explorer querier?

Guide on how to use the explorer apis and add a new type to it:

• https://github.com/weaveworks/weave-gitops-enterprise/blob/main/docs/extending-explorer.md
• Maybe we start with clusters first?

[foot]

cc @enekofb @jpellizzari wdyt?

[enekofb]

sounds definitely worthy to spike it with one of them!

I think that a good approach would be someone from Pesto to pair with any of us in the spike?

[foot]

• https://github.com/weaveworks/weave-gitops-interlock/issues/501

[foot]

https://docs.gitops.weave.works/docs/next/explorer/getting-started/

[enekofb]

@foot @ranatrk this document is also internal for extending explorer https://github.com/weaveworks/weave-gitops-enterprise/blob/main/docs/extending-explorer.md

Adding you to the slack channel if you need any support

[foot]

Issues w/ templates:

• They have custom filtering based on template contents (lets drop this feature for now)
• They have custom filtering based on a specific label (check w/ Jordan about this, he did some work) -- this is not implemented yet, lets move forward w/ migrating templates to the Explorer, and we can bring this feature back later.
• ~Drop support for CAPITemplates in the UI~ cx still using them

[foot]

• BE work for templates, will be very similar to https://github.com/weaveworks/weave-gitops-enterprise/pull/3267 but adding 2 new CRs this time (GitOpsTemplate and CAPITemplate)
• Then FE work to be done for both gitopssets and both template types
  • Replace the components on their pages with <Explorer types={["gitopssets"]} /> (?) kind of thing, we can do this in follow up PRs