[processor/k8sattributes] Move k8sattr.fieldExtractConfigRegex.disallow feature gate to Beta (open-telemetry#36410)

<!-- Issue number (e.g. open-telemetry#1234) or full URL to issue, if applicable. -->
#### Link to tracking issue
Fixes open-telemetry#25128

---------

Signed-off-by: odubajDT <[email protected]>
Co-authored-by: Christos Markou <[email protected]>

Author: 2 people

.chloggen/k8sattributeprocessor-fg.yaml

@@ -0,0 +1,26 @@
+# 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.fieldExtractConfigRegex.disallow feature gate to Beta."
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [25128]
+
+# (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: "Disable the `k8sattr.fieldExtractConfigRegex.disallow` feature gate to get the old behavior."
+# 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/config.go

@@ -17,7 +17,7 @@ import (
 
 var disallowFieldExtractConfigRegex = featuregate.GlobalRegistry().MustRegister(
 	"k8sattr.fieldExtractConfigRegex.disallow",
-	featuregate.StageAlpha,
+	featuregate.StageBeta,
 	featuregate.WithRegisterDescription("When enabled, usage of the FieldExtractConfig.Regex field is disallowed"),
 	featuregate.WithRegisterFromVersion("v0.106.0"),
 )

processor/k8sattributesprocessor/config_test.go

@@ -109,6 +109,7 @@ func TestLoadConfig(t *testing.T) {
 				},
 				WaitForMetadataTimeout: 10 * time.Second,
 			},
+			disallowRegex: false,
 		},
 		{
 			id: component.NewIDWithName(metadata.Type, "3"),
@@ -155,6 +156,7 @@ func TestLoadConfig(t *testing.T) {
 				},
 				WaitForMetadataTimeout: 10 * time.Second,
 			},
+			disallowRegex: false,
 		},
 		{
 			id: component.NewIDWithName(metadata.Type, "too_many_sources"),
@@ -209,10 +211,10 @@ func TestLoadConfig(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.id.String(), func(t *testing.T) {
-			if tt.disallowRegex {
-				require.NoError(t, featuregate.GlobalRegistry().Set(disallowFieldExtractConfigRegex.ID(), true))
+			if !tt.disallowRegex {
+				require.NoError(t, featuregate.GlobalRegistry().Set(disallowFieldExtractConfigRegex.ID(), false))
 				t.Cleanup(func() {
-					require.NoError(t, featuregate.GlobalRegistry().Set(disallowFieldExtractConfigRegex.ID(), false))
+					require.NoError(t, featuregate.GlobalRegistry().Set(disallowFieldExtractConfigRegex.ID(), true))
 				})
 			}
 			cm, err := confmaptest.LoadConf(filepath.Join("testdata", "config.yaml"))