Add panel to dashboard, add percent field

[fearful-symmetry]

closes: elastic/beats#38708
For more context: elastic/beats#39205

This PR adds support in integrations for the new queue percentage full metric. As part of this, we:

• Add a Queue Usage panel to the agent metrics dashboard
• Add a queue.filled.pct.events field to the integrations

I haven't tinkered with integrations in ages, so...I hopefully haven't broken anything.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

[elasticmachine]

Pinging @elastic/elastic-agent (Team:Elastic-Agent)

[ycombinator]

@fearful-symmetry Would you mind adding a screenshot of the new panel in the dashboard to this PR's description?

[leehinman]

@fearful-symmetry the code changes look fine, but holding off approval till we get a screen shot. I'm not very good at rendering those kibana json files into dashboards in my head :-)

[fearful-symmetry]

Alright, uploaded a screenshot. Also made me realize that I didn't set the percentage correctly. I think it's right now?

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: d59a0e2

History

• 💚 Build #11001 succeeded b65246f

cc @fearful-symmetry

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarQube

[fearful-symmetry]

@leehinman / @ycombinator

[leehinman]

LGTM

[elasticmachine]

Package elastic_agent - 1.19.0 containing this change is available at https://epr.elastic.co/search?package=elastic_agent

[elasticmachine]

Package elastic_agent - 1.19.1 containing this change is available at https://epr.elastic.co/search?package=elastic_agent