fix: add back gzip support for grpc otlp endpoint (#11434)

* fix: add back gzip support for grpc otlp endpoint

* changelog: add changelog entry

(cherry picked from commit cfce80b)

# Conflicts:
#	changelogs/head.asciidoc

changelogs/head.asciidoc

@@ -0,0 +1,20 @@
+[[release-notes-head]]
+== APM version HEAD
+
+https://github.com/elastic/apm-server/compare/8.10\...main[View commits]
+
+[float]
+==== Breaking Changes
+
+[float]
+==== Deprecations
+
+[float]
+==== Bug fixes
+- Add back gzip support for grpc otlp endpoint {pull}11434[11434]
+
+[float]
+==== Intake API Changes
+
+[float]
+==== Added

internal/beater/beater.go

@@ -39,6 +39,7 @@ import (
 	"golang.org/x/sync/errgroup"
 	"golang.org/x/sync/semaphore"
 	"google.golang.org/grpc"
+	_ "google.golang.org/grpc/encoding/gzip"
 
 	"github.com/elastic/beats/v7/libbeat/beat"
 	"github.com/elastic/beats/v7/libbeat/esleg/eslegclient"

systemtest/otlp_test.go

@@ -206,7 +206,7 @@ func TestOTLPGRPCMetrics(t *testing.T) {
 
 	// opentelemetry-go does not support sending Summary metrics,
 	// so we send them using the lower level OTLP/gRPC client.
-	conn, err := grpc.Dial(serverAddr(srv), grpc.WithInsecure(), grpc.WithBlock())
+	conn, err := grpc.Dial(serverAddr(srv), grpc.WithInsecure(), grpc.WithBlock(), grpc.WithDefaultCallOptions(grpc.UseCompressor("gzip")))
 	require.NoError(t, err)
 	defer conn.Close()
 	metricsClient := pmetricotlp.NewGRPCClient(conn)
@@ -238,7 +238,7 @@ func TestOTLPGRPCLogs(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	conn, err := grpc.Dial(serverAddr(srv), grpc.WithInsecure(), grpc.WithBlock())
+	conn, err := grpc.Dial(serverAddr(srv), grpc.WithInsecure(), grpc.WithBlock(), grpc.WithDefaultCallOptions(grpc.UseCompressor("gzip")))
 	require.NoError(t, err)
 	defer conn.Close()