Remove use of beats_stats.metrics.apm-server.server.response.errors.concurrency

[carsonip]

Summary

beats_stats.metrics.apm-server.server.response.errors.concurrency was never emitted by apm-server. Remove it from stack monitoring UI.

elastic/elasticsearch#110568 contains a workaround for this.

Checklist

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• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
• Flaky Test Runner was used on any tests changed
• Any UI touched in this PR is usable by keyboard only (learn more about keyboard accessibility)
• Any UI touched in this PR does not create any new axe failures (run axe in browser: FF, Chrome)
• If a plugin configuration key changed, check if it needs to be allowlisted in the cloud and added to the docker list
• This renders correctly on smaller devices using a responsive layout. (You can test this in your browser)
• This was checked for cross-browser compatibility

Risk Matrix

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Before closing this PR, invite QA, stakeholders, and other developers to identify risks that should be tested prior to the change/feature release.

When forming the risk matrix, consider some of the following examples and how they may potentially impact the change:

Risk	Probability	Severity	Mitigation/Notes
Multiple Spaces—unexpected behavior in non-default Kibana Space.	Low	High	Integration tests will verify that all features are still supported in non-default Kibana Space and when user switches between spaces.
Multiple nodes—Elasticsearch polling might have race conditions when multiple Kibana nodes are polling for the same tasks.	High	Low	Tasks are idempotent, so executing them multiple times will not result in logical error, but will degrade performance. To test for this case we add plenty of unit tests around this logic and document manual testing procedure.
Code should gracefully handle cases when feature X or plugin Y are disabled.	Medium	High	Unit tests will verify that any feature flag or plugin combination still results in our service operational.
See more potential risk examples

For maintainers

• This was checked for breaking API changes and was labeled appropriately

[obltmachine]

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
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[elasticmachine]

⏳ Build in-progress, with failures

• Buildkite Build
• Commit: 67e9059

Failed CI Steps

• FTR Configs #83
• FTR Configs #101
• FTR Configs #101

Test Failures

• [job] [logs] FTR Configs #83 / InfraOps App Metrics UI Node Details #With Asset Details #Asset Type: host #With Kubernetes section Overview Tab normalizedLoad1m tile should show 1,300.3%
• [job] [logs] FTR Configs #101 / Monitoring APM overview should summarize apm cluster with metrics
• [job] [logs] FTR Configs #101 / Monitoring APM overview should summarize apm cluster with metrics