fix: use towncrier changelog fragment instead of editing CHANGELOG.md

Author: RiyaChaturvedi37

.changelog/.gitignore

@@ -0,0 +1 @@
+!.gitignore

.changelog/4216.fixed

@@ -0,0 +1 @@
+`opentelemetry-instrumentation-aws-lambda`: fix improper handling of header casing

.changelog/4504.fixed

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+`opentelemetry-instrumentation-celery`: clear completed task ids from `task_id_to_start_time`

.changelog/4505.fixed

@@ -0,0 +1 @@
+`opentelemetry-instrumentation-celery`: add null guards and type-safe helper handling around Celery context propagation internals

.changelog/4561.added

@@ -0,0 +1 @@
+`opentelemetry-instrumentation-dbapi`: Add `comment_position` option to `_add_sql_comment()` to support prepending sqlcommenter comment to the beginning of the query

CHANGELOG.md

@@ -2,19 +2,27 @@
 
 All notable changes to this project will be documented in this file.
 
+<!--
+Do *NOT* add changelog entries here!
+
+This changelog is managed by towncrier and is compiled at release time.
+
+See https://github.com/open-telemetry/opentelemetry-python-contrib/blob/main/CONTRIBUTING.md#changelog for details.
+-->
+
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 > [!NOTE]
 > The following components are released independently and maintain individual CHANGELOG files.
 > Use [this search for a list of all CHANGELOG.md files in this repo](https://github.com/search?q=repo%3Aopen-telemetry%2Fopentelemetry-python-contrib+path%3A**%2FCHANGELOG.md&type=code).
 
+<!-- changelog start -->
+
 ## Unreleased
 
 ### Added
 
-- `opentelemetry-instrumentation-dbapi`: Add `comment_position` option to `_add_sql_comment()` to support prepending sqlcommenter comment to the beginning of the query
-  ([#4561](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4561))
 - Add `BaggageLogProcessor` to `opentelemetry-processor-baggage`
   ([#4371](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4371))
 - `opentelemetry-instrumentation-system-metrics`: Add support for `process.disk.io` metric in system-metrics instrumentation
@@ -95,6 +103,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#4049](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4049))
 - `opentelemetry-instrumentation-sqlalchemy`: implement new semantic convention opt-in migration
   ([#4110](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4110))
+- `opentelemetry-instrumentation`: Add experimental metrics attributes Labeler utility
+  ([#4288](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4288))
+- `opentelemetry-instrumentation-redis`: implement new semantic convention opt-in migration
+  ([#4370](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4370))
 
 ### Fixed
 
@@ -124,6 +136,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `opentelemetry-instrumentation-boto`: Remove instrumentation
   ([#4303](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4303))
 
+### Added
+
+- `opentelemetry-instrumentation-dbapi`: implement new semantic convention opt-in migration
+  ([#4109](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4109))
+
 ## Version 1.40.0/0.61b0 (2026-03-04)
 
 ### Added