Nr 239607 export and display fb internal metrics

[jsubirat]

Give us some context

• What problems does this PR solve? It includes a new section to explain how to export troubleshooting metrics from one of our Helm charts and how to display them using a template dashboard file.

• Add any context that will help us review your changes such as testing notes, links to related docs, screenshots, etc. The newrelic-logging Helm chart is a component that can be deployed on a Kubernetes cluster in order to forward logs from other components (pods) running in that cluster. This Helm chart is based on an open-source log forwarder named Fluent Bit. Sometimes, customers face problems when running Fluent Bit, and in this pull request we include instructions to collect metrics from Fluent Bit and represent them in a dashboard to facilitate the troubleshooting of that component.

• If your issue relates to an existing GitHub issue, please link to it. N/A/

[CLAassistant]

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[CLAassistant]

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1 out of 2 committers have signed the CLA.

:white_check_mark: nbaenam
:x: jsubirat
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[github-actions[bot]]

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[homelessbirds]

@jsubirat let us know in the #help-documentation channel when you're ready for us to review this!