Add saved object tags to SLOs to enable consistent filtering

[rayafratkina]

Describe the feature:
Saved object tagging has been available for a while and is proving to be useful as a way to filter objects created to make related objects easier to find.

In the course of working with Serverless observability, we found that it's really hard to find SLOs that our team has created without the tags. Can we please add tags to SLOs?

See #85741 for tagging rollout stragglers

[elasticmachine]

Pinging @elastic/unified-observability (Team:Observability)

[elasticmachine]

Pinging @elastic/appex-sharedux (Team:SharedUX)

[rayafratkina]

cc @smith

[vadimkibana]

@elastic/unified-observability are SLOs in Kibana saved objects? If yes, then the tagging should work for them, it would be only a UI work to expose it to the end users.

[kdelemme]

we found that it's really hard to find SLOs that our team has created without the tags.

Are you searching for the SLO in the saved object management page directly? Why?

[afharo]

@rayafratkina, don't SLOs have tags already?

https://overview.elastic-cloud.com/app/observability/slos?search=(filters:!(),groupBy:ungrouped,kqlQuery:%27slo.tags%20:%20%22kibana%22%20%27,lastRefresh:1713450453156,page:0,perPage:25,sort:(by:status,direction:desc),view:cardView)

Are you talking about anything else?

It's worth highlighting that they are internal tags (not the core-native tags).

[kdelemme]

I'd like to understand better the need for surfacing the tags on the SO directly.

They are currently internal because we should not attempt to find SLO through the saved objects directly. We have an API that abstract the internal storage model (SO) for anyone to use. If something is missing on the API, we could improve it instead of accessing directly the internal storage model. If you want to find this from backend, we might need to introduce a client from our slo plugin.
But I might have some missing information as to why we wants to have the SLO SavedObjects searchable. Happy to chat :)