Add examples folder for alerts & dashboards, and observability stack

[david-martin]

Part of #448

There are separate issues to update these dashboards, add new ones and add example alerts, all tracked in #439

There's a separate PR for how these dashboards will be included as part of the release process.
Kuadrant/architecture#85

To verify this PR, the single cluster getting started guide can be followed https://docs.kuadrant.io/getting-started-single-cluster/
Then run the commands from the observability README in the PR to deploy the stack and access grafana or prometheus.

You can also import the example dashboards json into grafana.
For data to show up on the dashboards, you can follow the guide at https://docs.kuadrant.io/kuadrant-operator/doc/user-guides/secure-protect-connect/ to create various gateway api and kuadrant resources.

[codecov]

Codecov Report

Merging #461 (fa9976c) into main (e51ddaf) will decrease coverage by 51.27%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #461       +/-   ##
===========================================
- Coverage   81.30%   30.03%   -51.27%     
===========================================
  Files          64       58        -6     
  Lines        4492     4132      -360     
===========================================
- Hits         3652     1241     -2411     
- Misses        567     2822     +2255     
+ Partials      273       69      -204     

Flag	Coverage Δ
integration	?
unit	30.03% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
api/v1beta1 (u)	∅ <ø> (∅)
api/v1beta2 (u)	50.71% <ø> (-40.72%)	⬇️
pkg/common (u)	87.70% <ø> (-1.12%)	⬇️
pkg/istio (u)	41.61% <ø> (-33.55%)	⬇️
pkg/log (u)	36.84% <ø> (-57.90%)	⬇️
pkg/reconcilers (u)	38.20% <ø> (-28.09%)	⬇️
pkg/rlptools (u)	56.40% <ø> (-23.06%)	⬇️
controllers (i)	8.09% <ø> (-70.45%)	⬇️

see 46 files with indirect coverage changes

[R-Lawton]

👀

[R-Lawton]

Feedback on Dashboards:
app-developer:
The table should use center it looks cleaner and fit screens better

platform:

• Im thinking the single stat values could be a little bit bigger i don't see the table needing as much space as it has

• Gateway table is all squshed into the corner would be better to have even spaced and in the center

• Space out table columns evenly and center them
  

• Center the apis table columns

[david-martin]

Feedback on Dashboards

Thanks for the feedback on the dashboards.
While this PR is moreso getting the examples in place and a process for developing dashboards, those notes should be helpful for the follow up issues #434 and #435 (the former which has a PR already #494).
I'll leave any modifications to the dashboards out of this PR so that it can land earlier and we'll have the process in place for updating as needed then.

[R-Lawton]

ah ok deadly if its just to get things up and running, it does what it says on the tin monitoring pods are up

[david-martin]

@R-Lawton I've pushed up the recommended changes.
The link to the examples folder works locally in vscode, but not in the preview. I think it should work when back on main rather than viewing it in the PR rich diff view.

[jasonmadigan]

lgtm