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Log database errors

Stan Hu requested to merge sh-show-database-connection-errors into master

Previously all PG::ConnectionBad errors were quietly swallowed. We now pass along a logger so that we can see when these errors occur. For example:

2020-07-03_00:14:18.42120 E, [2020-07-02T19:14:18.421063 #17532] ERROR -- : Error connecting to the database: could not connect to server: Connection refused
2020-07-03_00:14:18.42122       Is the server running on host "10.138.0.7" and accepting
2020-07-03_00:14:18.42123       TCP/IP connections on port 5432?
2020-07-03_00:14:18.42123

Closes https://gitlab.com/gitlab-org/gitlab-exporter/-/issues/72

Edited by Stan Hu

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