[Enhancement][Fleet]: Action under Agent Activity if 10k agents fail to upgrade to latest version.

[amolnater-qasource]

Question:

• Installed 10k agents using Horde.
• Add invalid agent binary so that the agent upgrade fails.
• Upgrade the available 10k agents and observe all the agents failed.
• Observe under Agent activity below error:

However for few agents if agent upgrade fails we get below error which is expected under https://github.com/elastic/kibana/issues/141206:

Could you please confirm the behaviour of this error under Agent activity for 10k agents?

Build details: VERSION: 8.8.0 Snapshot BUILD: 61938 COMMIT: 1b18bc20b6d779d3b0d8dca35be584e0e04a5faa

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[amolnater-qasource]

@manishgupta-qasource Please review.

[manishgupta-qasource]

Secondary review for this ticket is Done

[juliaElastic]

I think the difference is that in the first case the action status is ROLLOUT_PASSED, and currently we only display error details for FAILED status. We can convert this an enhancement issue and enable error display for ROLLOUT_PASSED status too. cc @kpollich