Changelog + readme

CHANGELOG.md

@@ -1,4 +1,5 @@
 ## main / unreleased
+* [CHANGE] **BREAKING CHANGE** The Tempo serverless is now deprecated and will be removed in an upcoming release [#4017](https://github.com/grafana/tempo/pull/4017/) @electron0zero
 * [CHANGE] **BREAKING CHANGE** Change the AWS Lambda serverless build tooling output from "main" to "bootstrap". Refer to https://aws.amazon.com/blogs/compute/migrating-aws-lambda-functions-from-the-go1-x-runtime-to-the-custom-runtime-on-amazon-linux-2/ for migration steps [#3852](https://github.com/grafana/tempo/pull/3852) (@zatlodan)
 * [CHANGE] Add throughput and SLO metrics in the tags and tag values endpoints [#4148](https://github.com/grafana/tempo/pull/4148) (@electron0zero)
 * [CHANGE] tempo-cli: add support for /api/v2/traces endpoint [#4127](https://github.com/grafana/tempo/pull/4127) (@electron0zero)

cmd/tempo-serverless/readme.md

@@ -1,5 +1,7 @@
 # tempo-serverless
 
+## NOTE: The Tempo serverless is now deprecated and will be removed in an upcoming release.
+
 This folder is intended to wrap a simple handler for searching backend storage for traces. Subfolders 
 `./cloud-run` and `./lambda` contain specific code necessary to run this handler in the respective
 environments.