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>

pkg/utils/tracing/tracing.go

@@ -10,6 +10,17 @@ import (
 	"go.uber.org/zap"
 )
 
+func TracingEnabled(logger *zap.Logger) bool {
+	openTracingEnabled, err := strconv.ParseBool(os.Getenv("OPENTRACING_ENABLED"))
+	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")