cleanup: Remove Opentracing support as no active users (#2196)

References:
[1] #2193
[2] https://fissionio.slack.com/archives/C3LUX6BBP/p1631706812069300

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

pkg/utils/tracing/tracing.go

@@ -1,60 +0,0 @@
-package tracing
-
-import (
-	"os"
-	"strconv"
-	"strings"
-
-	"contrib.go.opencensus.io/exporter/jaeger"
-	"go.opencensus.io/trace"
-	"go.uber.org/zap"
-)
-
-func TracingEnabled(logger *zap.Logger) bool {
-	tracingEnabled := os.Getenv("TRACING_ENABLED")
-	if len(tracingEnabled) == 0 {
-		return false
-	}
-	openTracingEnabled, err := strconv.ParseBool(tracingEnabled)
-	if err != nil {
-		if logger != nil {
-			logger.Error("Error parsing OpenTracing enabled flag", zap.Error(err))
-		}
-		return false
-	}
-	return openTracingEnabled
-}
-
-func RegisterTraceExporter(logger *zap.Logger, collectorEndpoint, serviceName string) error {
-	if len(collectorEndpoint) == 0 {
-		logger.Info("skipping trace exporter registration")
-		return nil
-	}
-
-	exporter, err := jaeger.NewExporter(jaeger.Options{
-		CollectorEndpoint: collectorEndpoint,
-		Process: jaeger.Process{
-			ServiceName: serviceName,
-			Tags: []jaeger.Tag{
-				jaeger.BoolTag("fission", true),
-			},
-		},
-	})
-	if err != nil {
-		return err
-	}
-
-	trace.RegisterExporter(exporter)
-
-	if strings.EqualFold(serviceName, "Fission-Fetcher") {
-		trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
-	} else {
-		samplingRate, err := strconv.ParseFloat(os.Getenv("TRACING_SAMPLING_RATE"), 32)
-		if err != nil {
-			return err
-		}
-		trace.ApplyConfig(trace.Config{DefaultSampler: trace.ProbabilitySampler(samplingRate)})
-	}
-
-	return nil
-}