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/fetcher/client/client.go

@@ -6,8 +6,6 @@ import (
 	"encoding/json"
 	"io/ioutil"
 	"net/http"
-	"os"
-	"strconv"
 	"strings"
 	"time"
 
@@ -19,6 +17,7 @@ import (
 
 	ferror "github.com/fission/fission/pkg/error"
 	"github.com/fission/fission/pkg/fetcher"
+	"github.com/fission/fission/pkg/utils/tracing"
 )
 
 type (
@@ -30,13 +29,8 @@ type (
 )
 
 func MakeClient(logger *zap.Logger, fetcherUrl string) *Client {
-	openTracingEnabled, err := strconv.ParseBool(os.Getenv("OPENTRACING_ENABLED"))
-	if err != nil {
-		logger.Fatal("error parsing OPENTRACING_ENABLED", zap.Error(err))
-	}
-
 	var hc *http.Client
-	if openTracingEnabled {
+	if tracing.TracingEnabled(logger) {
 		hc = &http.Client{Transport: &ochttp.Transport{}}
 	} else {
 		hc = &http.Client{Transport: otelhttp.NewTransport(http.DefaultTransport)}