-remoteWrite.rateLimit for vmagent

[Olliferdl]

Description

When there is a lot of buffered data, from a lot of clients, being sent all at once after the pmm-server was down or unreachable for a while, the server or network can be overwhelmed.
This could be counteracted by setting a rate limit for the vmagent.

Suggested solution

Allow configuration of the vmagent launch arguments somewhere

Additional context

https://docs.victoriametrics.com/vmagent.html#advanced-usage:~:text=%2DremoteWrite.rateLimit%20array,the%20remote%20storage

Code of Conduct

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[BupycHuk]

Hi @Olliferdl, we are implementing this feature in scope of https://jira.percona.com/browse/PMM-9374, so there will be a possibility to pass VMAGENT_* env variables to PMM Server and this will be available on all vmagents connected to the PMM.