[Alert table grouping] Allow expanding one of the groups

[maryam-saeidi]

Summary

As mentioned in #195627, we would like to be able to expand one of the groups based on the group ID. Besides using it in ECO, we also have a similar use cases for the alert details page as mentioned below.

Acceptance Criteria

• Control which grouping is expanded

Use cases

• The primary use case for ECO is to link to the alerts page, grouped by Rule Name, and expand the rule name base on rule.id).

  

• Use this logic in the related alert on the alert details page: expanding the first group

  

[elasticmachine]

Pinging @elastic/obs-ux-management-team (Team:obs-ux-management)

[elasticmachine]

Pinging @elastic/response-ops (Team:ResponseOps)

[maryam-saeidi]

@simianhacker For the ECO use-case, how do you decide which rule should be expanded?

[simianhacker]

Ideally, we'd pass the Rule ID.

[maryam-saeidi]

@simianhacker, I meant, how do you know which rule is visible on the first page, and what are the criteria for choosing which rule to expand?
The reason for asking is that maybe we can simplify this logic for now and expand the first rule if that works for ECO as well.

[simianhacker]

@maryam-saeidi Can we have a URL parameter like openGroup={rule.id}?

[maryam-saeidi]

@simianhacker I meant, how do you decide which rule.id to pass via URL parameters? Do you get all the rules related to an entity and then decide which one to open?

[simianhacker]

@maryam-saeidi Yes... we will have the rule.id through our discovery.