Remove deprecated high cardinality metrics feature gate (open-telemetry#14373)

This feature gate has been deprecated since 0.132.0, which is way more
than the 2 releases we require for deprecated feature flags.

See open-telemetry#13538

Author: dmathieu

.chloggen/remove-disable-high-cardinality-metrics-fg.yaml

@@ -0,0 +1,25 @@
+# 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. receiver/otlp)
+component: pkg/service
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Remove deprecated `telemetry.disableHighCardinalityMetrics` feature gate.
+
+# One or more tracking issues or pull requests related to the change
+issues: [14373]
+
+# (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:
+
+# 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: [user]

service/service.go

@@ -23,7 +23,6 @@ import (
 	"go.opentelemetry.io/collector/connector"
 	"go.opentelemetry.io/collector/exporter"
 	"go.opentelemetry.io/collector/extension"
-	"go.opentelemetry.io/collector/featuregate"
 	"go.opentelemetry.io/collector/pdata/pcommon"
 	"go.opentelemetry.io/collector/processor"
 	"go.opentelemetry.io/collector/receiver"
@@ -36,15 +35,6 @@ import (
 	"go.opentelemetry.io/collector/service/telemetry"
 )
 
-// This feature gate is deprecated and will be removed in 1.40.0. Views can now be configured.
-var _ = featuregate.GlobalRegistry().MustRegister(
-	"telemetry.disableHighCardinalityMetrics",
-	featuregate.StageDeprecated,
-	featuregate.WithRegisterToVersion("0.133.0"),
-	featuregate.WithRegisterDescription(
-		"Controls whether the collector should enable potentially high "+
-			"cardinality metrics. Deprecated, configure service::telemetry::metrics::views instead."))
-
 // ModuleInfo describes the Go module for a particular component.
 type ModuleInfo = moduleinfo.ModuleInfo