Fix mongodb_up not set when instance is down #624
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When a MongoDB instance is down, the exporter does not produce any metrics, while we would expect it to return
mongodb_up 0
. This fix is an attempt to fix issues described in #347, #444 and #483.It's my first PR on Go code so any feedback would be useful !
Also, sorry if I missed something on the whole PR process, don't hesitate to tell me 😅
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