Add cardinality API qps to Overview dashboard

[flxbk]

What this PR does

This adds requests to the /api/v1/cardinality/... endpoints to the Overview dashboard. Series for requests in this category will only be displayed if there have been any requests in the selected time frame.

Fixes #

Checklist

• Tests updated.
• Documentation added.
• CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX].
• about-versioning.md updated with experimental features.

[dimitarvdimitrov]

WDYT about displaying all cardinality requests there under one category? Currently cardinality label values and names is missing.

[flxbk]

WDYT about displaying all cardinality requests there under one category?

what do you mean by "under one category"?

[dimitarvdimitrov]

WDYT about displaying all cardinality requests there under one category?

what do you mean by "under one category"?

I think I meant having just a single line in the graph for all of them

[flxbk]

If there's any issue caused by a particular type of request I think it could be helpful to get an immediate visual breakdown by request type instead of having different types lumped into the same category. WDYT about adding > 0 to the other (cardinality API) types as well to avoid cluttering the panel legend?

[dimitarvdimitrov]

If there's any issue caused by a particular type of request I think it could be helpful to get an immediate visual breakdown by request type instead of having different types lumped into the same category. WDYT about adding > 0 to the other (cardinality API) types as well to avoid cluttering the panel legend?

sounds like a good middle ground 👍

[flxbk]

I have added the other cardinality endpoints as well.

[dimitarvdimitrov]

LGTM