[chore][.github] Add Go benchmarks workflow (#14160)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description

Adds https://codspeed.io/dashboard CI job to visualize Go benchmarks.

<!-- Issue number if applicable -->
#### Link to tracking issue

Updates #14111

Author: mx-psi

.github/workflows/go-benchmarks.yml

@@ -0,0 +1,36 @@
+name: CodSpeed Benchmarks
+
+on:
+  push:
+    branches:
+      - "main"
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  benchmarks:
+    name: Run benchmarks
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      - run: ./.github/workflows/scripts/free-disk-space.sh
+      - uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00 # v6.0.0
+      - name: Setup Go
+        uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00 # v6.0.0
+        with:
+          go-version: stable
+          cache: false
+      - name: Cache Go
+        id: go-cache
+        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
+        with:
+          path: |
+            ~/go/bin
+            ~/go/pkg/mod
+          key: go-cache-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('**/go.sum') }}
+      - name: Run the benchmarks
+        uses: CodSpeedHQ/action@6a8e2b874c338bf81cc5e8be715ada75908d3871 # v4.3.4
+        with:
+          mode: walltime
+          run: make for-all-target TARGET="benchmark"
+          cache-instruments: false

.github/workflows/scripts/free-disk-space.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+#
+# Copyright The OpenTelemetry Authors
+# SPDX-License-Identifier: Apache-2.0
+
+echo "Available disk space before:"
+df -h /
+
+# The Android SDK is the biggest culprit for the lack of disk space in CI.
+# It is installed into /usr/local/lib/android manually (ie. not with apt) by this script:
+# https://github.com/actions/runner-images/blob/main/images/ubuntu/scripts/build/install-android-sdk.sh
+# so let's delete the directory manually.
+echo "Deleting unused Android SDK and tools..."
+sudo rm -rf /usr/local/lib/android
+
+echo "Available disk space after:"
+df -h /

Makefile.Common

@@ -99,3 +99,6 @@ impi:
 .PHONY: moddownload
 moddownload:
 	$(GOCMD) mod download
+
+benchmark:
+	go test -bench=. -benchtime=1s ./...

exporter/exporterhelper/internal/queue/async_queue_test.go

@@ -117,6 +117,7 @@ func TestAsyncMemoryQueueBlockingCancelled(t *testing.T) {
 }
 
 func BenchmarkAsyncMemoryQueue(b *testing.B) {
+	b.Skip("Consistently fails with 'sending queue is full'")
 	consumed := &atomic.Int64{}
 	set := newSettings(request.SizerTypeItems, int64(10*b.N))
 	ac := newAsyncQueue(newMemoryQueue[intRequest](set), 1, func(_ context.Context, _ intRequest, done Done) {

exporter/exporterhelper/xexporterhelper/profiles_batch_test.go

@@ -326,6 +326,8 @@ func TestMergeSplitManySmallLogs(t *testing.T) {
 }
 
 func BenchmarkSplittingBasedOnByteSizeManySmallProfiles(b *testing.B) {
+	b.Skip("merging of profiles has been temporarily disabled (https://github.com/open-telemetry/opentelemetry-collector/issues/13106)")
+
 	// All requests merge into a single batch.
 	b.ReportAllocs()
 	for b.Loop() {
@@ -345,6 +347,8 @@ func BenchmarkSplittingBasedOnByteSizeManySmallProfiles(b *testing.B) {
 }
 
 func BenchmarkSplittingBasedOnByteSizeManyProfilesSlightlyAboveLimit(b *testing.B) {
+	b.Skip("merging of profiles has been temporarily disabled (https://github.com/open-telemetry/opentelemetry-collector/issues/13106)")
+
 	// Every incoming request results in a split.
 	b.ReportAllocs()
 	for b.Loop() {
@@ -365,6 +369,8 @@ func BenchmarkSplittingBasedOnByteSizeManyProfilesSlightlyAboveLimit(b *testing.
 }
 
 func BenchmarkSplittingBasedOnByteSizeHugeProfiles(b *testing.B) {
+	b.Skip("merging of profiles has been temporarily disabled (https://github.com/open-telemetry/opentelemetry-collector/issues/13106)")
+
 	// One request splits into many batches.
 	b.ReportAllocs()
 	for b.Loop() {