sidenote about future metrics improvements.

Author: jiahuif

content/en/blog/_posts/2024-04-24-validating-admission-policy-ga/index.md

@@ -281,4 +281,6 @@ To find the rate of the policy evaluation.
 rate(apiserver_validating_admission_policy_check_total{policy="pod-security.policy.example.com"}[5m])
 ```
 
-You can read [the metrics reference](/docs/reference/instrumentation/metrics/) to learn more about the metrics above.
+You can read [the metrics reference](/docs/reference/instrumentation/metrics/) to learn more about the metrics above.
+The metrics of ValidatingAdmissionPolicy are currently in alpha,
+and more and better metrics will come while the stability graduates in the future release.