[extension/k8s leader elector] Stability level alpha and enable chang…

…elog (#38426)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description
- Change the stability level to alpha and allow print it in the change
log.
- Also adjust the documentation

PR for
[Implementation](#38015)
Pr for [Basic
structure](#37266)

<!-- Issue number (e.g. #1234) or full URL to issue, if applicable. -->
#### Link to tracking issue
Fixes

#34460
<!--Describe what testing was performed and which tests were added.-->
#### Testing

<!--Describe the documentation added.-->
#### Documentation
provided
<!--Please delete paragraphs that you did not use before submitting.-->

.chloggen/update-doc-k8s-leader-elector.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type:
+  new_component
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component:
+  k8sleaderelector
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: allows single instance of the receiver/exporter to be active via kubernetes leader election mechanism
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [34460]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

cmd/otelcontribcol/builder-config.yaml

@@ -50,6 +50,7 @@ extensions:
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/extension/encoding/textencodingextension v0.121.0
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/extension/encoding/zipkinencodingextension v0.121.0
   - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/extension/encoding/skywalkingencodingextension v0.121.0
+  - gomod: github.com/open-telemetry/opentelemetry-collector-contrib/extension/k8sleaderelector v0.121.0
 
 exporters:
   - gomod: go.opentelemetry.io/collector/exporter/debugexporter v0.121.0

extension/k8sleaderelector/README.md

@@ -2,12 +2,12 @@
 <!-- status autogenerated section -->
 | Status        |           |
 | ------------- |-----------|
-| Stability     | [development]  |
+| Stability     | [alpha]  |
 | Distributions | [] |
 | Issues        | [![Open issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aopen%20label%3Aextension%2Fk8sleaderelector%20&label=open&color=orange&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aopen+is%3Aissue+label%3Aextension%2Fk8sleaderelector) [![Closed issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aclosed%20label%3Aextension%2Fk8sleaderelector%20&label=closed&color=blue&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aclosed+is%3Aissue+label%3Aextension%2Fk8sleaderelector) |
 | [Code Owners](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/CONTRIBUTING.md#becoming-a-code-owner)    | [@dmitryax](https://www.github.com/dmitryax), [@rakesh-garimella](https://www.github.com/rakesh-garimella) |
 
-[development]: https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/component-stability.md#development
+[alpha]: https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/component-stability.md#alpha
 <!-- end autogenerated section -->
 
 This extension enables OpenTelemetry components to run in HA mode across a Kubernetes cluster. The component that owns the lease becomes the leader and becomes the active instance.
@@ -16,12 +16,13 @@ This extension enables OpenTelemetry components to run in HA mode across a Kuber
 ## How It Works
 
 The extension uses k8s.io/client-go/tools/leaderelection to perform leader election. The component that owns the lease becomes the leader and runs the function defined in onStartedLeading. If the leader loses the lease, it runs the function defined in onStoppedLeading, stops its operation, and waits to acquire the lease again.
+
 ## Configuration
 
 ```yaml
 receivers:
   my_awesome_receiver:
-    leader_elector: k8s_leader_elector
+    k8s_leader_elector: k8s_leader_elector
 extensions:
   k8s_leader_elector:
     auth_type: kubeConfig
@@ -44,6 +45,11 @@ service:
 | **renew_deadline**  | The deadline for renewing the lease. It must be less than the lease duration. | 10s             |
 | **retry_period**    | The period for retrying the leader election.                                  | 2s              |
 
+### Delete the lease object
+```shell
+kubectl delete leases.coordination.k8s.io -n <namespace> <lease_name>
+```
+
 ### Suggested RBAC
 ```yaml
 apiVersion: rbac.authorization.k8s.io/v1

extension/k8sleaderelector/metadata.yaml

@@ -3,7 +3,7 @@ type: k8s_leader_elector
 status:
   class: extension
   stability:
-    development: [extension]
+    alpha: [extension]
   distributions: []
   codeowners:
     active: [dmitryax, rakesh-garimella]