docs: add fluentd buffers vs DPM calculations info for metrics

[perk-sumo]

Description

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Checklist

Remove items which don't apply to your PR.

• Changelog updated

Testing performed

• Redeploy fluentd and fluentd-events pods
• Confirm events, logs, and metrics are coming in

[frankreno]

This lgTM. Do we not want to have a section for logs/events as well?

[swiatekm]

I think it'd be safer to divide the final values by 2 to account for uneven load on FluentD instances. Even with the remote write proxy, we're still relying on Kubernetes Service load balancing, which is far from perfect.

[perk-sumo]

I think it'd be safer to divide the final values by 2 to account for uneven load on FluentD instances.

Fair point, I've added that info and recommendation.

[perk-sumo]

This lgTM. Do we not want to have a section for logs/events as well?

We didn't check that for logs or events so cannot give such info yet.