File-based service discovery doesn't accept relative paths to files

[it-praktyk]

I tried configure the file-based service discovery with file pattern relatative to the main Prometheus configuration catalog (usually /etc/prometheus).

I've found that only full path is accepted - not relative path.

In my opinion issue is related to the line https://github.com/prometheus/prometheus/blob/master/discovery/file/file.go#L85 what currently is
paths = append(paths, files...)

In opposite rule files can be provided with a relative path because the line https://github.com/prometheus/prometheus/blob/master/config/config.go#L63 contains the additional command
resolveFilepaths(filepath.Dir(filename), cfg)

Confirmed with Prometheus 1.5.2.

[brian-brazil]

#2247 covers this.

[lock]

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