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/fetcher/client/client.go

@@ -10,14 +10,12 @@ import (
 	"time"
 
 	"github.com/pkg/errors"
-	"go.opencensus.io/plugin/ochttp"
 	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
 	"go.uber.org/zap"
 	"golang.org/x/net/context/ctxhttp"
 
 	ferror "github.com/fission/fission/pkg/error"
 	"github.com/fission/fission/pkg/fetcher"
-	"github.com/fission/fission/pkg/utils/tracing"
 )
 
 type (
@@ -29,13 +27,7 @@ type (
 )
 
 func MakeClient(logger *zap.Logger, fetcherUrl string) *Client {
-	var hc *http.Client
-	if tracing.TracingEnabled(logger) {
-		hc = &http.Client{Transport: &ochttp.Transport{}}
-	} else {
-		hc = &http.Client{Transport: otelhttp.NewTransport(http.DefaultTransport)}
-	}
-
+	hc := &http.Client{Transport: otelhttp.NewTransport(http.DefaultTransport)}
 	return &Client{
 		logger:     logger.Named("fetcher_client"),
 		url:        strings.TrimSuffix(fetcherUrl, "/"),

pkg/fetcher/config/config.go

@@ -34,8 +34,6 @@ type Config struct {
 	sharedCfgMapPath string
 
 	serviceAccount string
-
-	jaegerCollectorEndpoint string
 }
 
 func getFetcherResources() (apiv1.ResourceRequirements, error) {
@@ -82,14 +80,13 @@ func MakeFetcherConfig(sharedMountPath string) (*Config, error) {
 	}
 
 	return &Config{
-		resourceRequirements:    resources,
-		fetcherImage:            fetcherImage,
-		fetcherImagePullPolicy:  utils.GetImagePullPolicy(fetcherImagePullPolicy),
-		sharedMountPath:         sharedMountPath,
-		sharedSecretPath:        "/secrets",
-		sharedCfgMapPath:        "/configs",
-		jaegerCollectorEndpoint: os.Getenv("TRACE_JAEGER_COLLECTOR_ENDPOINT"),
-		serviceAccount:          fv1.FissionFetcherSA,
+		resourceRequirements:   resources,
+		fetcherImage:           fetcherImage,
+		fetcherImagePullPolicy: utils.GetImagePullPolicy(fetcherImagePullPolicy),
+		sharedMountPath:        sharedMountPath,
+		sharedSecretPath:       "/secrets",
+		sharedCfgMapPath:       "/configs",
+		serviceAccount:         fv1.FissionFetcherSA,
 	}, nil
 }
 
@@ -169,7 +166,6 @@ func (cfg *Config) fetcherCommand(extraArgs ...string) []string {
 	command := []string{"/fetcher",
 		"-secret-dir", cfg.sharedSecretPath,
 		"-cfgmap-dir", cfg.sharedCfgMapPath,
-		"-jaeger-collector-endpoint", cfg.jaegerCollectorEndpoint,
 	}
 
 	command = append(command, extraArgs...)

pkg/fetcher/fetcher.go

@@ -31,7 +31,6 @@ import (
 	"github.com/mholt/archiver/v3"
 	"github.com/pkg/errors"
 	uuid "github.com/satori/go.uuid"
-	"go.opencensus.io/plugin/ochttp"
 	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
 	"go.uber.org/zap"
 	"golang.org/x/net/context/ctxhttp"
@@ -53,7 +52,6 @@ import (
 	storageSvcClient "github.com/fission/fission/pkg/storagesvc/client"
 	"github.com/fission/fission/pkg/utils"
 	otelUtils "github.com/fission/fission/pkg/utils/otel"
-	"github.com/fission/fission/pkg/utils/tracing"
 )
 
 type (
@@ -107,13 +105,7 @@ func MakeFetcher(logger *zap.Logger, sharedVolumePath string, sharedSecretPath s
 		return nil, errors.Wrap(err, "error reading pod namespace from downward volume")
 	}
 
-	var hc *http.Client
-	if tracing.TracingEnabled(logger) {
-		hc = &http.Client{Transport: &ochttp.Transport{}}
-	} else {
-		hc = &http.Client{Transport: otelhttp.NewTransport(http.DefaultTransport)}
-	}
-
+	hc := &http.Client{Transport: otelhttp.NewTransport(http.DefaultTransport)}
 	return &Fetcher{
 		logger:           fLogger,
 		sharedVolumePath: sharedVolumePath,