Little fixes to the prometheus sink (#115)

* Add uint64 to float64 cast option

* Add prometheus sink to the list of available sinks

* Add aggregated counters by gpu for nvlink errors

---------

Co-authored-by: Michael Schwarz <schwarz@uni-paderborn.de>

sinks/prometheusSink.go

@@ -49,6 +49,8 @@ func intToFloat64(input interface{}) (float64, error) {
 		return float64(value), nil
 	case int64:
 		return float64(value), nil
+	case uint64:
+		return float64(value), nil
 	}
 	return 0, errors.New("cannot cast value to float64")
 }

sinks/sinkManager.go

@@ -21,6 +21,7 @@ var AvailableSinks = map[string]func(name string, config json.RawMessage) (Sink,
 	"influxdb":    NewInfluxSink,
 	"influxasync": NewInfluxAsyncSink,
 	"http":        NewHttpSink,
+	"prometheus":  NewPrometheusSink,
 }
 
 // Metric collector manager data structure