Unify Metrics' products operational configuration
The method/process of deployment configuration of Metrics' products should be unified. Afterwards, we look for the 'tool' or lib helping to achieve a simplification.
The thought that triggered this ticket: Looks like metrics-bot recently switched to using Apache Commons Configuration as configuration library (#23933 (closed)). We should consider doing the same for other metrics parts, maybe after waiting a bit and hearing how that works out.