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Log a warning that file-configs override service-discovery configs #3898

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sodabrew
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What does this PR do?

Logs a warning if a service-discovery configured check will be ignored if the same-named check was already configured from a file.

Motivation

I have an haproxy.yaml file pointing at one instance of haproxy that I want to monitor on all servers. I am using Docker service discovery to configure other containers for service checks. This week I wanted to deploy a new use case for an haproxy container, and so I diligently added the Docker labels for an haproxy check. Nothing happened. Radio silence in the logs files.

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Additional Notes

A better fix would be to merge the instances list from the file with the service discovered-instances list. Ironically, there is code in the service discovery config module to do exactly this, and then it is dutifully discarded if a file config exists. But first I want to solve the head-banging-on-wall problem of failing to log the discarded config.

@sodabrew
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Do Agent 6 or 7 allow checks defined in multiple sources per my use case?

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