[Elastic Agent] Update Metrics

[strawgate]

Fixes #12488

Replaces closed PR: #12524

Benefits from:

• Include full queue metrics in the monitoring index beats#42439
• Write latency statistics go under a histogram key beats#42514
• Wire in Kafka read and write metrics beats#42537
• Add latency metrics for logstash async output beats#42565

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.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

Author's Checklist

Related issues

Screenshots

Overview

Concerning Agents

Agent Metrics

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: b94af0ff459f283a32054e3a3913de5af107b1a7

[elastic-sonarqube]

Quality Gate failed

Failed conditions
75.8% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube