Performance improvements for the trace SDK in `Span`. (#5874) #832

	name: Benchmark
	on:
	push:
	branches:
	- main
	workflow_dispatch:

	env:
	DEFAULT_GO_VERSION: "~1.23.0"
	jobs:
	benchmark:
	name: Benchmarks
	runs-on: self-hosted
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-go@v5
	with:
	go-version: ${{ env.DEFAULT_GO_VERSION }}
	check-latest: true
	cache-dependency-path: "**/go.sum"
	- name: Run benchmarks
	run: make benchmark \| tee output.txt
	- name: Download previous benchmark data
	uses: actions/cache/restore@v4
	with:
	path: ./benchmarks
	# `github.event.before` means the commit before the push (i.e. the previous commit).
	# So we can fetch the exact benchmark data from the previous commit.
	key: ${{ runner.os }}-benchmark-${{ github.event.before }}
	- name: Store benchmarks result
	uses: benchmark-action/github-action-benchmark@v1.20.3
	with:
	name: Benchmarks
	tool: 'go'
	output-file-path: output.txt
	external-data-json-path: ./benchmarks/data.json
	github-token: ${{ secrets.GITHUB_TOKEN }}
	gh-pages-branch: benchmarks
	fail-on-alert: true
	alert-threshold: "400%"
	# Add benchmark summary to GitHub workflow run report
	summary-always: true
	- name: Save benchmark data
	uses: actions/cache/save@v4
	# The cache will be saved even if a step fails.
	if: always()
	with:
	path: ./benchmarks
	# Use the current commit SHA as the cache key.
	key: ${{ runner.os }}-benchmark-${{ github.sha }}

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