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/otel/log.go

@@ -0,0 +1,30 @@
+/*
+Copyright 2021 The Fission Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+package otel
+
+import (
+	"context"
+
+	"go.opentelemetry.io/otel/trace"
+	"go.uber.org/zap"
+)
+
+func LoggerWithTraceID(context context.Context, logger *zap.Logger) *zap.Logger {
+	if span := trace.SpanContextFromContext(context); span.TraceID().IsValid() {
+		return logger.With(zap.String("trace_id", span.TraceID().String()))
+	}
+	return logger
+}