use tags instead of logs

pkg/tsdb/graphite/graphite.go

@@ -18,7 +18,6 @@ import (
 	"github.com/grafana/grafana/pkg/setting"
 	"github.com/grafana/grafana/pkg/tsdb"
 	opentracing "github.com/opentracing/opentracing-go"
-	tlog "github.com/opentracing/opentracing-go/log"
 )
 
 type GraphiteExecutor struct {
@@ -83,11 +82,9 @@ func (e *GraphiteExecutor) Execute(ctx context.Context, queries tsdb.QuerySlice,
 	}
 
 	span, ctx := opentracing.StartSpanFromContext(ctx, "alerting.graphite")
-	span.LogFields(
-		tlog.String("target", target),
-		tlog.String("from", from),
-		tlog.String("until", until),
-	)
+	span.SetTag("target", target)
+	span.SetTag("from", from)
+	span.SetTag("until", until)
 	defer span.Finish()
 
 	opentracing.GlobalTracer().Inject(

pkg/tsdb/prometheus/prometheus.go

@@ -20,7 +20,6 @@ import (
 	"github.com/prometheus/common/model"
 	//api "github.com/prometheus/client_golang/api"
 	//apiv1 "github.com/prometheus/client_golang/api/prometheus/v1"
-	tlog "github.com/opentracing/opentracing-go/log"
 )
 
 type PrometheusExecutor struct {
@@ -105,11 +104,9 @@ func (e *PrometheusExecutor) Execute(ctx context.Context, queries tsdb.QuerySlic
 	}
 
 	span, ctx := opentracing.StartSpanFromContext(ctx, "alerting.prometheus")
-	span.LogFields(
-		tlog.String("expr", query.Expr),
-		tlog.Int64("start_unixnano", int64(query.Start.UnixNano())),
-		tlog.Int64("stop_unixnano", int64(query.End.UnixNano())),
-	)
+	span.SetTag("expr", query.Expr)
+	span.SetTag("start_unixnano", int64(query.Start.UnixNano()))
+	span.SetTag("stop_unixnano", int64(query.End.UnixNano()))
 	defer span.Finish()
 
 	value, err := client.QueryRange(ctx, query.Expr, timeRange)