Add scrapeClasses to OpenTelemetryCollector CRD

Signed-off-by: Christian Ciach <christian.ciach@gmail.com>

Author: ChristianCiach

.chloggen/allocator-scrapeclasses.yaml

@@ -0,0 +1,18 @@
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. collector, target allocator, auto-instrumentation, opamp, github action)
+component: target allocator
+
+# A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add prometheus ScrapeClass support
+
+# One or more tracking issues related to the change
+issues: [3600]
+
+# (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:
+  Added support for configuring `scrapeClasses` when using the PrometheusCR-feature of the target allocator.
+  The format of the `scrapeClasses` array is exactly as same as `spec.scrapeClasses` of the `Prometheus` CRD.

README.md

@@ -708,6 +708,7 @@ spec:
       enabled: true
       serviceMonitorSelector: {}
       podMonitorSelector: {}
+      scrapeClasses: []
   config:
     receivers:
       prometheus:
@@ -724,6 +725,9 @@ spec:
 EOF
 ```
 
+The `scrapeClasses` attribute refers to the ScrapeClass feature of the Prometheus Operator.
+Refer to https://prometheus-operator.dev/docs/developer/scrapeclass/ to learn more about scrape classes.
+
 ## Configure resource attributes
 
 The OpenTelemetry Operator can automatically set resource attributes as defined in the 

apis/v1beta1/targetallocator_types.go

@@ -25,6 +25,12 @@ type TargetAllocatorPrometheusCR struct {
 	// +kubebuilder:default:="30s"
 	// +kubebuilder:validation:Format:=duration
 	ScrapeInterval *metav1.Duration `json:"scrapeInterval,omitempty"`
+	// ScrapeClasses to be referenced by PodMonitors and ServiceMonitors to include common configuration.
+	// If specified, expects an array of ScrapeClass objects as specified by https://prometheus-operator.dev/docs/api-reference/api/#monitoring.coreos.com/v1.ScrapeClass.
+	// +optional
+	// +listType=atomic
+	// +kubebuilder:pruning:PreserveUnknownFields
+	ScrapeClasses []AnyConfig `json:"scrapeClasses,omitempty"`
 	// PodMonitors to be selected for target discovery.
 	// A label selector is a label query over a set of resources. The result of matchLabels and
 	// matchExpressions are ANDed. An empty label selector matches all objects. A null

apis/v1beta1/zz_generated.deepcopy.go

@@ -99,7 +99,7 @@ metadata:
     categories: Logging & Tracing,Monitoring
     certified: "false"
     containerImage: ghcr.io/open-telemetry/opentelemetry-operator/opentelemetry-operator
-    createdAt: "2025-11-20T10:03:26Z"
+    createdAt: "2025-12-05T15:25:47Z"
     description: Provides the OpenTelemetry components, including the Collector
     operators.operatorframework.io/builder: operator-sdk-v1.29.0
     operators.operatorframework.io/project_layout: go.kubebuilder.io/v3

bundle/community/manifests/opentelemetry-operator.clusterserviceversion.yaml

@@ -8027,6 +8027,12 @@ spec:
                             type: object
                         type: object
                         x-kubernetes-map-type: atomic
+                      scrapeClasses:
+                        items:
+                          type: object
+                        type: array
+                        x-kubernetes-list-type: atomic
+                        x-kubernetes-preserve-unknown-fields: true
                       scrapeConfigSelector:
                         properties:
                           matchExpressions:

bundle/community/manifests/opentelemetry.io_opentelemetrycollectors.yaml

@@ -2335,6 +2335,12 @@ spec:
                         type: object
                     type: object
                     x-kubernetes-map-type: atomic
+                  scrapeClasses:
+                    items:
+                      type: object
+                    type: array
+                    x-kubernetes-list-type: atomic
+                    x-kubernetes-preserve-unknown-fields: true
                   scrapeConfigSelector:
                     properties:
                       matchExpressions:

bundle/community/manifests/opentelemetry.io_targetallocators.yaml

@@ -99,7 +99,7 @@ metadata:
     categories: Logging & Tracing,Monitoring
     certified: "false"
     containerImage: ghcr.io/open-telemetry/opentelemetry-operator/opentelemetry-operator
-    createdAt: "2025-11-20T10:03:26Z"
+    createdAt: "2025-12-05T15:25:48Z"
     description: Provides the OpenTelemetry components, including the Collector
     operators.operatorframework.io/builder: operator-sdk-v1.29.0
     operators.operatorframework.io/project_layout: go.kubebuilder.io/v3

bundle/openshift/manifests/opentelemetry-operator.clusterserviceversion.yaml

@@ -8026,6 +8026,12 @@ spec:
                             type: object
                         type: object
                         x-kubernetes-map-type: atomic
+                      scrapeClasses:
+                        items:
+                          type: object
+                        type: array
+                        x-kubernetes-list-type: atomic
+                        x-kubernetes-preserve-unknown-fields: true
                       scrapeConfigSelector:
                         properties:
                           matchExpressions:

bundle/openshift/manifests/opentelemetry.io_opentelemetrycollectors.yaml

@@ -2335,6 +2335,12 @@ spec:
                         type: object
                     type: object
                     x-kubernetes-map-type: atomic
+                  scrapeClasses:
+                    items:
+                      type: object
+                    type: array
+                    x-kubernetes-list-type: atomic
+                    x-kubernetes-preserve-unknown-fields: true
                   scrapeConfigSelector:
                     properties:
                       matchExpressions: