From 34c7391195eb7a70e91c72a277bcaab540028240 Mon Sep 17 00:00:00 2001
From: ChrsMark <chrismarkou92@gmail.com>
Date: Tue, 3 Dec 2024 16:49:27 +0200
Subject: [PATCH] add replication_controller metrics

Signed-off-by: ChrsMark <chrismarkou92@gmail.com>
---
 .chloggen/add_deploy_replica_metrics.yaml |  2 +-
 docs/system/k8s-metrics.md                | 53 +++++++++++++++++++++++
 model/k8s/metrics.yaml                    | 22 ++++++++++
 3 files changed, 76 insertions(+), 1 deletion(-)

diff --git a/.chloggen/add_deploy_replica_metrics.yaml b/.chloggen/add_deploy_replica_metrics.yaml
index 568b2e2ac7..da8cb10914 100755
--- a/.chloggen/add_deploy_replica_metrics.yaml
+++ b/.chloggen/add_deploy_replica_metrics.yaml
@@ -10,7 +10,7 @@ change_type: enhancement
 component: k8s
 
 # A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`).
-note: Add desired and available metrics for k8s deployment and replicaset
+note: Add desired and available metrics for k8s deployment, replicaset and replication_controller
 
 # Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
 # The values here must be integers.
diff --git a/docs/system/k8s-metrics.md b/docs/system/k8s-metrics.md
index 3f33085a29..92e2c5dbf5 100644
--- a/docs/system/k8s-metrics.md
+++ b/docs/system/k8s-metrics.md
@@ -39,6 +39,9 @@ and therefore inherit its attributes, like `k8s.pod.name` and `k8s.pod.uid`.
 - [ReplicaSet Metrics](#replicaset-metrics)
   - [Metric: `k8s.replicaset.desired`](#metric-k8sreplicasetdesired)
   - [Metric: `k8s.replicaset.available`](#metric-k8sreplicasetavailable)
+- [ReplicationController Metrics](#replicationcontroller-metrics)
+  - [Metric: `k8s.replication_controller.desired`](#metric-k8sreplication_controllerdesired)
+  - [Metric: `k8s.replication_controller.available`](#metric-k8sreplication_controlleravailable)
 
 <!-- tocstop -->
 
@@ -464,5 +467,55 @@ This metric is [recommended][MetricRecommended].
 <!-- END AUTOGENERATED TEXT -->
 <!-- endsemconv -->
 
+## ReplicationController Metrics
+
+**Description:** ReplicationController level metrics captured under the namespace `k8s.replication_controller`.
+
+### Metric: `k8s.replication_controller.desired`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.replication_controller.desired -->
+<!-- NOTE: THIS TEXT IS AUTOGENERATED. DO NOT EDIT BY HAND. -->
+<!-- see templates/registry/markdown/snippet.md.j2 -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-capture -->
+<!-- markdownlint-disable -->
+
+| Name     | Instrument Type | Unit (UCUM) | Description    | Stability |
+| -------- | --------------- | ----------- | -------------- | --------- |
+| `k8s.replication_controller.desired` | Gauge | `{pod}` | Number of desired pods in this replication controller [1] | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
+
+**[1]:** This metric aligns with the `replicas` field of the
+[K8s ReplicationController Spec](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.30/#replicationcontrollerspec-v1-core)
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
+### Metric: `k8s.replication_controller.available`
+
+This metric is [recommended][MetricRecommended].
+
+<!-- semconv metric.k8s.replication_controller.available -->
+<!-- NOTE: THIS TEXT IS AUTOGENERATED. DO NOT EDIT BY HAND. -->
+<!-- see templates/registry/markdown/snippet.md.j2 -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-capture -->
+<!-- markdownlint-disable -->
+
+| Name     | Instrument Type | Unit (UCUM) | Description    | Stability |
+| -------- | --------------- | ----------- | -------------- | --------- |
+| `k8s.replication_controller.available` | Gauge | `{pod}` | Total number of available pods (ready for at least minReadySeconds) targeted by this replication controller [1] | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
+
+**[1]:** This metric aligns with the `availableReplicas` field of the
+[K8s ReplicationController Status](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.30/#replicationcontrollerstatus-v1-core)
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+<!-- END AUTOGENERATED TEXT -->
+<!-- endsemconv -->
+
 [DocumentStatus]: https://opentelemetry.io/docs/specs/otel/document-status
 [MetricRecommended]: /docs/general/metric-requirement-level.md#recommended
diff --git a/model/k8s/metrics.yaml b/model/k8s/metrics.yaml
index 6c8ccd162c..94060976f6 100644
--- a/model/k8s/metrics.yaml
+++ b/model/k8s/metrics.yaml
@@ -170,3 +170,25 @@ groups:
       [K8s ReplicaSet Status](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.30/#replicasetstatus-v1-apps)
     instrument: gauge
     unit: "{pod}"
+
+  # k8s.replication_controller.* metrics
+  - id: metric.k8s.replication_controller.desired
+    type: metric
+    metric_name: k8s.replication_controller.desired
+    stability: experimental
+    brief: "Number of desired pods in this replication controller"
+    note: |
+      This metric aligns with the `replicas` field of the
+      [K8s ReplicationController Spec](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.30/#replicationcontrollerspec-v1-core)
+    instrument: gauge
+    unit: "{pod}"
+  - id: metric.k8s.replication_controller.available
+    type: metric
+    metric_name: k8s.replication_controller.available
+    stability: experimental
+    brief: "Total number of available pods (ready for at least minReadySeconds) targeted by this replication controller"
+    note: |
+      This metric aligns with the `availableReplicas` field of the
+      [K8s ReplicationController Status](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.30/#replicationcontrollerstatus-v1-core)
+    instrument: gauge
+    unit: "{pod}"