[processor/k8sattributes] Move feature gate k8sattr.rfc3339 to stable (…

…open-telemetry#33304)

**Description:**
Move feature gate k8sattr.rfc3339 to stable

.chloggen/k8sattr.rfc3339.stable.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: breaking
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: k8sattributesprocessor
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Move `k8sattr.rfc3339` feature gate to stable.
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [33304]
+
+# (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: []

processor/k8sattributesprocessor/README.md

@@ -330,8 +330,5 @@ as tags.
 
 ## Timestamp Format
 
-By default, the `k8s.pod.start_time` uses [Time.String()](https://pkg.go.dev/time#Time.String) to format the
-timestamp value. 
-
-The `k8sattr.rfc3339` feature gate can be enabled to format the `k8s.pod.start_time` timestamp value with an RFC3339 
-compliant timestamp. See [Time.MarshalText()](https://pkg.go.dev/time#Time.MarshalText) for more information.
+By default, the `k8s.pod.start_time` uses [Time.MarshalText()](https://pkg.go.dev/time#Time.MarshalText) to format the
+timestamp value as an RFC3339 compliant timestamp.

processor/k8sattributesprocessor/internal/kube/client.go

@@ -26,12 +26,12 @@ import (
 	"github.com/open-telemetry/opentelemetry-collector-contrib/processor/k8sattributesprocessor/internal/observability"
 )
 
-// Upgrade to StageStable in v0.92.0
 var enableRFC3339Timestamp = featuregate.GlobalRegistry().MustRegister(
 	"k8sattr.rfc3339",
-	featuregate.StageBeta,
+	featuregate.StageStable,
 	featuregate.WithRegisterDescription("When enabled, uses RFC3339 format for k8s.pod.start_time value"),
 	featuregate.WithRegisterFromVersion("v0.82.0"),
+	featuregate.WithRegisterToVersion("v0.102.0"),
 )
 
 // WatchClient is the main interface provided by this package to a kubernetes cluster.

processor/k8sattributesprocessor/internal/kube/client_test.go

@@ -11,7 +11,6 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"go.opentelemetry.io/collector/featuregate"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
 	"go.uber.org/zap/zaptest/observer"
@@ -643,136 +642,6 @@ func TestHandlerWrongType(t *testing.T) {
 	}
 }
 
-func TestRFC3339FeatureGate(t *testing.T) {
-	err := featuregate.GlobalRegistry().Set(enableRFC3339Timestamp.ID(), true)
-	require.NoError(t, err)
-
-	c, _ := newTestClientWithRulesAndFilters(t, Filters{})
-	// Disable saving ip into k8s.pod.ip
-	c.Associations[0].Sources[0].Name = ""
-
-	pod := &api_v1.Pod{
-		ObjectMeta: meta_v1.ObjectMeta{
-			Name:              "auth-service-abc12-xyz3",
-			UID:               "aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee",
-			Namespace:         "ns1",
-			CreationTimestamp: meta_v1.Now(),
-			Labels: map[string]string{
-				"label1": "lv1",
-				"label2": "k1=v1 k5=v5 extra!",
-			},
-			Annotations: map[string]string{
-				"annotation1": "av1",
-			},
-			OwnerReferences: []meta_v1.OwnerReference{
-				{
-					APIVersion: "apps/v1",
-					Kind:       "ReplicaSet",
-					Name:       "auth-service-66f5996c7c",
-					UID:        "207ea729-c779-401d-8347-008ecbc137e3",
-				},
-				{
-					APIVersion: "apps/v1",
-					Kind:       "DaemonSet",
-					Name:       "auth-daemonset",
-					UID:        "c94d3814-2253-427a-ab13-2cf609e4dafa",
-				},
-				{
-					APIVersion: "batch/v1",
-					Kind:       "Job",
-					Name:       "auth-cronjob-27667920",
-					UID:        "59f27ac1-5c71-42e5-abe9-2c499d603706",
-				},
-				{
-					APIVersion: "apps/v1",
-					Kind:       "StatefulSet",
-					Name:       "pi-statefulset",
-					UID:        "03755eb1-6175-47d5-afd5-05cfc30244d7",
-				},
-			},
-		},
-		Spec: api_v1.PodSpec{
-			NodeName: "node1",
-			Hostname: "host1",
-		},
-		Status: api_v1.PodStatus{
-			PodIP: "1.1.1.1",
-		},
-	}
-
-	isController := true
-	replicaset := &apps_v1.ReplicaSet{
-		ObjectMeta: meta_v1.ObjectMeta{
-			Name:      "auth-service-66f5996c7c",
-			Namespace: "ns1",
-			UID:       "207ea729-c779-401d-8347-008ecbc137e3",
-			OwnerReferences: []meta_v1.OwnerReference{
-				{
-					Name:       "auth-service",
-					Kind:       "Deployment",
-					UID:        "ffff-gggg-hhhh-iiii-eeeeeeeeeeee",
-					Controller: &isController,
-				},
-			},
-		},
-	}
-
-	rfc3339ts, err := pod.GetCreationTimestamp().MarshalText()
-	require.NoError(t, err)
-
-	testCases := []struct {
-		name       string
-		rules      ExtractionRules
-		attributes map[string]string
-	}{{
-		name: "metadata",
-		rules: ExtractionRules{
-			DeploymentName: true,
-			DeploymentUID:  true,
-			Namespace:      true,
-			PodName:        true,
-			PodUID:         true,
-			PodHostName:    true,
-			Node:           true,
-			StartTime:      true,
-		},
-		attributes: map[string]string{
-			"k8s.deployment.name": "auth-service",
-			"k8s.deployment.uid":  "ffff-gggg-hhhh-iiii-eeeeeeeeeeee",
-			"k8s.namespace.name":  "ns1",
-			"k8s.node.name":       "node1",
-			"k8s.pod.name":        "auth-service-abc12-xyz3",
-			"k8s.pod.hostname":    "host1",
-			"k8s.pod.uid":         "aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee",
-			"k8s.pod.start_time":  string(rfc3339ts),
-		},
-	},
-	}
-	for _, tc := range testCases {
-		t.Run(tc.name, func(t *testing.T) {
-			c.Rules = tc.rules
-
-			// manually call the data removal functions here
-			// normally the informer does this, but fully emulating the informer in this test is annoying
-			transformedPod := removeUnnecessaryPodData(pod, c.Rules)
-			transformedReplicaset := removeUnnecessaryReplicaSetData(replicaset)
-			c.handleReplicaSetAdd(transformedReplicaset)
-			c.handlePodAdd(transformedPod)
-			p, ok := c.GetPod(newPodIdentifier("connection", "", pod.Status.PodIP))
-			require.True(t, ok)
-
-			assert.Equal(t, len(tc.attributes), len(p.Attributes))
-			for k, v := range tc.attributes {
-				got, ok := p.Attributes[k]
-				assert.True(t, ok)
-				assert.Equal(t, v, got)
-			}
-		})
-	}
-	err = featuregate.GlobalRegistry().Set(enableRFC3339Timestamp.ID(), false)
-	require.NoError(t, err)
-}
-
 func TestExtractionRules(t *testing.T) {
 	c, _ := newTestClientWithRulesAndFilters(t, Filters{})
 
@@ -955,7 +824,11 @@ func TestExtractionRules(t *testing.T) {
 			"k8s.pod.name":        "auth-service-abc12-xyz3",
 			"k8s.pod.hostname":    "host1",
 			"k8s.pod.uid":         "aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee",
-			"k8s.pod.start_time":  pod.GetCreationTimestamp().String(),
+			"k8s.pod.start_time": func() string {
+				b, err := pod.GetCreationTimestamp().MarshalText()
+				require.NoError(t, err)
+				return string(b)
+			}(),
 		},
 	}, {
 		name: "labels",

processor/k8sattributesprocessor/testdata/e2e/namespacedrbac/collector/deployment.yaml

@@ -21,7 +21,6 @@ spec:
           command:
             - /otelcontribcol
             - --config=/conf/relay.yaml
-            - --feature-gates=k8sattr.rfc3339
           image: "otelcontribcol:latest"
           imagePullPolicy: Never
           ports: