feature: Capture important events with span in fission and add trace id in logs (#2180)

* Capture important open telemetry events with span in fission
* Add context to missing HTTP calls
* Add Trace ID in logs
* capture trace id in the proxy handler function
* Always registry tracer to get traceID

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

cmd/fetcher/app/server.go

@@ -24,7 +24,6 @@ import (
 	"log"
 	"net/http"
 	"os"
-	"strconv"
 	"sync/atomic"
 
 	"go.opencensus.io/plugin/ochttp"
@@ -64,11 +63,7 @@ func Run(logger *zap.Logger) {
 		}
 	}
 
-	openTracingEnabled, err := strconv.ParseBool(os.Getenv("OPENTRACING_ENABLED"))
-	if err != nil {
-		logger.Fatal("error parsing OPENTRACING_ENABLED", zap.Error(err))
-	}
-
+	openTracingEnabled := tracing.TracingEnabled(logger)
 	if openTracingEnabled {
 		go func() {
 			if err := tracing.RegisterTraceExporter(logger, *collectorEndpoint, "Fission-Fetcher"); err != nil {

cmd/fission-bundle/main.go

@@ -225,11 +225,7 @@ Options:
 		logger.Fatal("Could not parse command line arguments", zap.Error(err))
 	}
 
-	openTracingEnabled, err := strconv.ParseBool(os.Getenv("OPENTRACING_ENABLED"))
-	if err != nil {
-		logger.Fatal("error parsing OPENTRACING_ENABLED", zap.Error(err))
-	}
-
+	openTracingEnabled := tracing.TracingEnabled(logger)
 	if openTracingEnabled {
 		err = tracing.RegisterTraceExporter(logger, os.Getenv("TRACE_JAEGER_COLLECTOR_ENDPOINT"), getServiceName(arguments))
 		if err != nil {