From 5183ea0bf03996c0de45ce9402eba12975b38b03 Mon Sep 17 00:00:00 2001
From: Jordan Liggitt <liggitt@google.com>
Date: Tue, 22 Jun 2021 14:02:17 -0400
Subject: [PATCH] PodSecurity: metrics: stub interface

Co-authored-by: Tim Allclair <timallclair@gmail.com>
---
 .../pod-security-admission/metrics/doc.go     | 18 ++++++++++++++
 .../pod-security-admission/metrics/metrics.go | 24 +++++++++++++++++++
 .../metrics/metrics_test.go                   | 17 +++++++++++++
 3 files changed, 59 insertions(+)
 create mode 100644 staging/src/k8s.io/pod-security-admission/metrics/doc.go
 create mode 100644 staging/src/k8s.io/pod-security-admission/metrics/metrics.go
 create mode 100644 staging/src/k8s.io/pod-security-admission/metrics/metrics_test.go

diff --git a/staging/src/k8s.io/pod-security-admission/metrics/doc.go b/staging/src/k8s.io/pod-security-admission/metrics/doc.go
new file mode 100644
index 00000000000..27091daf8e2
--- /dev/null
+++ b/staging/src/k8s.io/pod-security-admission/metrics/doc.go
@@ -0,0 +1,18 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package metrics contains metrics interfaces and implementations for PodSecurity admission
+package metrics // import "k8s.io/pod-security-admission/metrics"
diff --git a/staging/src/k8s.io/pod-security-admission/metrics/metrics.go b/staging/src/k8s.io/pod-security-admission/metrics/metrics.go
new file mode 100644
index 00000000000..ae7bf8fb86c
--- /dev/null
+++ b/staging/src/k8s.io/pod-security-admission/metrics/metrics.go
@@ -0,0 +1,24 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package metrics
+
+type EvaluationRecorder interface {
+	// TODO: fill in args required to record https://github.com/kubernetes/enhancements/tree/master/keps/sig-auth/2579-psp-replacement#monitoring
+	RecordEvaluation()
+}
+
+// TODO: default prometheus-based implementation
diff --git a/staging/src/k8s.io/pod-security-admission/metrics/metrics_test.go b/staging/src/k8s.io/pod-security-admission/metrics/metrics_test.go
new file mode 100644
index 00000000000..17911b6bc6c
--- /dev/null
+++ b/staging/src/k8s.io/pod-security-admission/metrics/metrics_test.go
@@ -0,0 +1,17 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package metrics