add metrics APIs and corresponding otel adapter #1282

	name: Go

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ '*' ]

	jobs:

	build:
	name: API Diff Check
	runs-on: ubuntu-latest
	steps:

	- name: Set up Go 1.x
	uses: actions/setup-go@v2
	with:
	go-version: "1.21"
	id: go

	- name: Check out code into the Go module directory
	uses: actions/checkout@v2

	- name: Get dependencies
	run: \|
	(cd /tmp && go install golang.org/x/exp/cmd/gorelease@latest)

	- name: Check APIs
	run: $(go env GOPATH)/bin/gorelease

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