[Alerting] Memory Usage alert

Error message

tsdb.HandleRequest() error Get "http://localhost:8086/query?db=backbonestats&epoch=s&q=SELECT+mean%28%22used_percent%22%29+FROM+%22mem%22+WHERE+time+%3E+now%28%29+-+5m+GROUP+BY+time%28200ms%29%2C+%22host%22+fill%28none%29": dial tcp [::1]:8086: connect: connection refused

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