update implementation history and link relevant PRs

Author: Han Kang

keps/sig-instrumentation/1209-metrics-stability/README.md

@@ -222,13 +222,19 @@ At worst, this thing can clog the commit pipeline (since it is effectively a con
 
 ## Implementation History
 
-See:
-
 1. [Metrics Stability Framework#Implementation History]
 1. [Metrics Stability Migration#Implementation History]
 1. [Metrics Validation and Verification#Implementation History]
 1. [Metrics Stability to Beta#Implementation History]
 
+Status: currently implemented.
+
+### Current list of stable metrics:
+
+1. [apiserver_request_total](https://github.com/kubernetes/kubernetes/pull/99788)
+2. [apiserver_storage_object_counts](https://github.com/kubernetes/kubernetes/pull/99785)
+3. [apiserver_request_duration_seconds](https://github.com/kubernetes/kubernetes/pull/99925)
+
 [Metrics Stability Framework#Implementation History]: kubernetes-control-plane-metrics-stability.md#implementation-history
 [Metrics Stability Migration#Implementation History]: metrics-stability-migration.md#implementation-history
 [Metrics Validation and Verification#Implementation History]: metrics-validation-and-verification.md#implementation-history

keps/sig-instrumentation/1209-metrics-stability/kubernetes-control-plane-metrics-stability.md

@@ -321,6 +321,7 @@ Metrics which are added dynamically after application boot - Metrics which are d
 - Wrappers added around prometheus registry and counter/counterVec metric type [PR-77037](https://github.com/kubernetes/kubernetes/pull/77037)
 - Wrappers added around prometheus gauge, histogram & summary metric types [PR-77618](https://github.com/kubernetes/kubernetes/pull/77618)
 - Make sig-instrumentation owners for component-base metrics directory [PR-77621](https://github.com/kubernetes/kubernetes/pull/77621)
+- [Allow explicit disabling of metrics as an escape hatch](https://github.com/kubernetes/kubernetes/pull/99217)
 
 ## References