Optional annotations (#2586)

* feat: Adding bool flag for pod annotations

* docs: Adding required docs

* nit: Adding optional kubebuilder validation comment and adding changelog

.chloggen/optional-annotations.yaml

@@ -0,0 +1,16 @@
+# 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. operator, target allocator, github action)
+component: operator, target allocator
+
+# A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Adding a feature flag to disable default prometheus annotations
+
+# One or more tracking issues related to the change
+issues: [2554]
+
+# (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:

apis/v1alpha1/opentelemetrycollector_types.go

@@ -521,6 +521,12 @@ type MetricsConfigSpec struct {
 	// +kubebuilder:validation:Optional
 	// +operator-sdk:csv:customresourcedefinitions:type=spec,displayName="Create ServiceMonitors for OpenTelemetry Collector"
 	EnableMetrics bool `json:"enableMetrics,omitempty"`
+	// DisablePrometheusAnnotations controls the automatic addition of default Prometheus annotations
+	// ('prometheus.io/scrape', 'prometheus.io/port', and 'prometheus.io/path')
+	//
+	// +optional
+	// +kubebuilder:validation:Optional
+	DisablePrometheusAnnotations bool `json:"DisablePrometheusAnnotations,omitempty"`
 }
 
 // ObservabilitySpec defines how telemetry data gets handled.

bundle/manifests/opentelemetry.io_opentelemetrycollectors.yaml

@@ -3867,6 +3867,11 @@ spec:
                   metrics:
                     description: Metrics defines the metrics configuration for operands.
                     properties:
+                      DisablePrometheusAnnotations:
+                        description: DisablePrometheusAnnotations controls the automatic
+                          addition of default Prometheus annotations ('prometheus.io/scrape',
+                          'prometheus.io/port', and 'prometheus.io/path')
+                        type: boolean
                       enableMetrics:
                         description: EnableMetrics specifies if ServiceMonitor or
                           PodMonitor(for sidecar mode) should be created for the service
@@ -5205,6 +5210,11 @@ spec:
                         description: Metrics defines the metrics configuration for
                           operands.
                         properties:
+                          DisablePrometheusAnnotations:
+                            description: DisablePrometheusAnnotations controls the
+                              automatic addition of default Prometheus annotations
+                              ('prometheus.io/scrape', 'prometheus.io/port', and 'prometheus.io/path')
+                            type: boolean
                           enableMetrics:
                             description: EnableMetrics specifies if ServiceMonitor
                               or PodMonitor(for sidecar mode) should be created for

config/crd/bases/opentelemetry.io_opentelemetrycollectors.yaml

@@ -3864,6 +3864,11 @@ spec:
                   metrics:
                     description: Metrics defines the metrics configuration for operands.
                     properties:
+                      DisablePrometheusAnnotations:
+                        description: DisablePrometheusAnnotations controls the automatic
+                          addition of default Prometheus annotations ('prometheus.io/scrape',
+                          'prometheus.io/port', and 'prometheus.io/path')
+                        type: boolean
                       enableMetrics:
                         description: EnableMetrics specifies if ServiceMonitor or
                           PodMonitor(for sidecar mode) should be created for the service
@@ -5202,6 +5207,11 @@ spec:
                         description: Metrics defines the metrics configuration for
                           operands.
                         properties:
+                          DisablePrometheusAnnotations:
+                            description: DisablePrometheusAnnotations controls the
+                              automatic addition of default Prometheus annotations
+                              ('prometheus.io/scrape', 'prometheus.io/port', and 'prometheus.io/path')
+                            type: boolean
                           enableMetrics:
                             description: EnableMetrics specifies if ServiceMonitor
                               or PodMonitor(for sidecar mode) should be created for

docs/api.md

@@ -17812,6 +17812,13 @@ Metrics defines the metrics configuration for operands.
         </tr>
     </thead>
     <tbody><tr>
+        <td><b>DisablePrometheusAnnotations</b></td>
+        <td>boolean</td>
+        <td>
+          DisablePrometheusAnnotations controls the automatic addition of default Prometheus annotations ('prometheus.io/scrape', 'prometheus.io/port', and 'prometheus.io/path')<br/>
+        </td>
+        <td>false</td>
+      </tr><tr>
         <td><b>enableMetrics</b></td>
         <td>boolean</td>
         <td>
@@ -20315,6 +20322,13 @@ Metrics defines the metrics configuration for operands.
         </tr>
     </thead>
     <tbody><tr>
+        <td><b>DisablePrometheusAnnotations</b></td>
+        <td>boolean</td>
+        <td>
+          DisablePrometheusAnnotations controls the automatic addition of default Prometheus annotations ('prometheus.io/scrape', 'prometheus.io/port', and 'prometheus.io/path')<br/>
+        </td>
+        <td>false</td>
+      </tr><tr>
         <td><b>enableMetrics</b></td>
         <td>boolean</td>
         <td>

internal/manifests/collector/annotations.go

@@ -26,10 +26,13 @@ func Annotations(instance v1alpha1.OpenTelemetryCollector) map[string]string {
 	// new map every time, so that we don't touch the instance's annotations
 	annotations := map[string]string{}
 
-	// set default prometheus annotations
-	annotations["prometheus.io/scrape"] = "true"
-	annotations["prometheus.io/port"] = "8888"
-	annotations["prometheus.io/path"] = "/metrics"
+	// Enable Prometheus annotations by default if DisablePrometheusAnnotations is nil or true
+	if !instance.Spec.Observability.Metrics.DisablePrometheusAnnotations {
+		// Set default Prometheus annotations
+		annotations["prometheus.io/scrape"] = "true"
+		annotations["prometheus.io/port"] = "8888"
+		annotations["prometheus.io/path"] = "/metrics"
+	}
 
 	// allow override of prometheus annotations
 	if nil != instance.Annotations {

internal/manifests/collector/annotations_test.go

@@ -51,6 +51,39 @@ func TestDefaultAnnotations(t *testing.T) {
 	assert.Equal(t, "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08", podAnnotations["opentelemetry-operator-config/sha256"])
 }
 
+func TestNonDefaultPodAnnotation(t *testing.T) {
+	// prepare
+	otelcol := v1alpha1.OpenTelemetryCollector{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      "my-instance",
+			Namespace: "my-ns",
+		},
+		Spec: v1alpha1.OpenTelemetryCollectorSpec{
+			Config: "test",
+			Observability: v1alpha1.ObservabilitySpec{
+				Metrics: v1alpha1.MetricsConfigSpec{
+					DisablePrometheusAnnotations: true,
+				},
+			},
+		},
+	}
+
+	// test
+	annotations := Annotations(otelcol)
+	podAnnotations := PodAnnotations(otelcol)
+
+	//verify
+	assert.NotContains(t, annotations, "prometheus.io/scrape", "Prometheus scrape annotation should not exist")
+	assert.NotContains(t, annotations, "prometheus.io/port", "Prometheus port annotation should not exist")
+	assert.NotContains(t, annotations, "prometheus.io/path", "Prometheus path annotation should not exist")
+	assert.Equal(t, "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08", annotations["opentelemetry-operator-config/sha256"])
+	//verify propagation from metadata.annotations to spec.template.spec.metadata.annotations
+	assert.NotContains(t, podAnnotations, "prometheus.io/scrape", "Prometheus scrape annotation should not exist in pod annotations")
+	assert.NotContains(t, podAnnotations, "prometheus.io/port", "Prometheus port annotation should not exist in pod annotations")
+	assert.NotContains(t, podAnnotations, "prometheus.io/path", "Prometheus path annotation should not exist in pod annotations")
+	assert.Equal(t, "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08", podAnnotations["opentelemetry-operator-config/sha256"])
+}
+
 func TestUserAnnotations(t *testing.T) {
 	// prepare
 	otelcol := v1alpha1.OpenTelemetryCollector{