Update agent-filtering-for-dogstatsd-custom-metrics.md with remote config + RBAC details

[olivielpeau]

What does this PR do? What is the motivation?

For Remote Config: I re-used and simplified the enablement instructions documented for APM tracing's RC setup: https://docs.datadoghq.com/tracing/guide/remote_config/

Merge instructions

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• Ready for merge

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Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/olivielpeau/agent-filtering-rc-rbac/metrics/guide/agent-filtering-for-dogstatsd-custom-metrics

[domalessi]

Left a few suggestions. Let me know if you have any Qs, and hit me up for re-review when ready!

[domalessi]

Suggested change

	- Ensure that your RBAC permissions include [`org_management`][2] and that [Remote Configuration][3] is enabled for your organization.
	- Ensure that your RBAC permissions include [`api_keys_write`][4] and that the [Remote Configuration capability is enabled on the API keys][5] used by your Agents. After enabling Remote Configuration on an API key, an Agent restart is required for Remote Configuration enablement to take effect.
	- Ensure that your RBAC permissions include [`org_management`][2] and [`api_keys_write`][4].
	- Enable [Remote Configuration][3] for your organization.
	- Enable the Remote Configuration capability on the API keys][5] used by your Agents. After enabling Remote Configuration on an API key, an Agent restart is required for Remote Configuration enablement to take effect.

[olivielpeau]

What I mean to communicate with this structure is that, respectively:

• the org_management permission is only needed to validate that Remote Configuration is enabled for the org (and if not, to enable it)
• the api_keys_write permission is only needed to validate that the API keys have Remote Configuration enabled (and if not, enable it on them)

but that these permissions are not needed to use the feature, they're only needed during the initial setup.

I'm under the impression that your proposed changes would make this less clear. But I'm also open to suggestions on how to make this more explicit/clear. WDYT?

[dmallon1]

LGTM!