[CONTP-947] Support openmetrics_endpoint in kube_scheduler check

kube_scheduler/CHANGELOG.md

@@ -2,6 +2,7 @@
 
 <!-- towncrier release notes start -->
 
+
 ## 7.0.1 / 2025-08-07
 
 ***Fixed***:

kube_scheduler/assets/configuration/spec.yaml

@@ -31,10 +31,23 @@ files:
       value:
         type: string
         example: http://localhost:10251/healthz
+    - name: openmetrics_endpoint
+      description: |
+        The URL exposing metrics in the OpenMetrics format.
+        One of openmetrics_endpoint or prometheus_url parameter is required.
+      required: false
+      value:
+        type: string
+        example: http://localhost:10251/metrics
+        display_priority: 1
     - template: instances/openmetrics_legacy
       overrides:
         prometheus_url.value.example: http://localhost:10251/metrics
-        prometheus_url.display_priority: 1
+        prometheus_url.display_priority: 2
+        prometheus_url.required: false
+        prometheus_url.description: |
+          The URL where your application metrics are exposed by Prometheus.
+          One of openmetrics_endpoint or prometheus_url parameter is required.
 
 - name: auto_conf.yaml
   options:

kube_scheduler/changelog.d/21178.added

@@ -0,0 +1 @@
+Add support for openmetrics_endpoint configuration parameter as an alternative to prometheus_url

kube_scheduler/datadog_checks/kube_scheduler/config_models/defaults.py

@@ -76,10 +76,18 @@ def instance_namespace():
     return 'service'
 
 
+def instance_openmetrics_endpoint():
+    return 'http://localhost:10251/metrics'
+
+
 def instance_persist_connections():
     return False
 
 
+def instance_prometheus_url():
+    return 'http://localhost:10251/metrics'
+
+
 def instance_request_size():
     return 10
 

kube_scheduler/datadog_checks/kube_scheduler/config_models/instance.py

@@ -119,10 +119,11 @@ class InstanceConfig(BaseModel):
     min_collection_interval: Optional[float] = None
     namespace: Optional[str] = None
     ntlm_domain: Optional[str] = None
+    openmetrics_endpoint: Optional[str] = None
     password: Optional[str] = None
     persist_connections: Optional[bool] = None
     prometheus_metrics_prefix: Optional[str] = None
-    prometheus_url: str
+    prometheus_url: Optional[str] = None
     proxy: Optional[Proxy] = None
     read_timeout: Optional[float] = None
     request_size: Optional[float] = None

kube_scheduler/datadog_checks/kube_scheduler/config_models/validators.py

@@ -3,11 +3,19 @@
 # Licensed under a 3-clause BSD style license (see LICENSE)
 
 # Here you can include additional config validators or transformers
-#
-# def initialize_instance(values, **kwargs):
-#     if 'my_option' not in values and 'my_legacy_option' in values:
-#         values['my_option'] = values['my_legacy_option']
-#     if values.get('my_number') > 10:
-#         raise ValueError('my_number max value is 10, got %s' % str(values.get('my_number')))
-#
-#     return values
+
+
+def initialize_instance(values, **kwargs):
+    """
+    Normalize instances to support both field names.
+    Parse prometheus_url first, if not available, fall back to openmetrics_endpoint.
+    """
+    # Map openmetrics_endpoint to prometheus_url if prometheus_url is not present
+    if 'openmetrics_endpoint' in values and 'prometheus_url' not in values:
+        values['prometheus_url'] = values['openmetrics_endpoint']
+
+    # Ensure at least one endpoint is provided
+    if not values.get('prometheus_url') and not values.get('openmetrics_endpoint'):
+        raise ValueError('Field `openmetrics_endpoint` or `prometheus_url` must be set')
+
+    return values

kube_scheduler/datadog_checks/kube_scheduler/data/conf.yaml.example

@@ -45,10 +45,12 @@ init_config:
 #
 instances:
 
-    ## @param prometheus_url - string - required
+  -
+    ## @param prometheus_url - string - optional - default: http://localhost:10251/metrics
     ## The URL where your application metrics are exposed by Prometheus.
+    ## One of openmetrics_endpoint or prometheus_url parameter is required.
     #
-  - prometheus_url: http://localhost:10251/metrics
+    # prometheus_url: http://localhost:10251/metrics
 
     ## @param leader_election - boolean - optional - default: true
     ## Monitor the leader-election process on the kube-system:kube-scheduler.
@@ -71,6 +73,12 @@ instances:
     #
     # health_url: http://localhost:10251/healthz
 
+    ## @param openmetrics_endpoint - string - optional - default: http://localhost:10251/metrics
+    ## The URL exposing metrics in the OpenMetrics format.
+    ## One of openmetrics_endpoint or prometheus_url parameter is required.
+    #
+    # openmetrics_endpoint: http://localhost:10251/metrics
+
     ## @param prometheus_metrics_prefix - string - optional
     ## Removes a given <PREFIX> from exposed Prometheus metrics.
     #

kube_scheduler/tests/test_validators.py

@@ -0,0 +1,48 @@
+# (C) Datadog, Inc. 2025-present
+# All rights reserved
+# Licensed under a 3-clause BSD style license (see LICENSE)
+
+import pytest
+
+from datadog_checks.kube_scheduler.config_models.validators import initialize_instance
+
+
+class TestValidators:
+    def test_openmetrics_endpoint_only(self):
+        """Test that openmetrics_endpoint gets mapped to prometheus_url when prometheus_url is not present"""
+        config = {"openmetrics_endpoint": "http://localhost:10251/metrics"}
+
+        # This should not raise an exception and should map openmetrics_endpoint to prometheus_url
+        result = initialize_instance(config)
+        assert result["openmetrics_endpoint"] == "http://localhost:10251/metrics"
+        assert result["prometheus_url"] == "http://localhost:10251/metrics"  # Should be mapped
+
+    def test_prometheus_url_only(self):
+        """Test that prometheus_url works without openmetrics_endpoint"""
+        config = {"prometheus_url": "http://localhost:10251/metrics"}
+
+        # This should not raise an exception
+        result = initialize_instance(config)
+        assert result["prometheus_url"] == "http://localhost:10251/metrics"
+        assert result.get("openmetrics_endpoint") is None
+
+    def test_both_endpoints(self):
+        """Test that both endpoints can be provided and prometheus_url takes precedence (no mapping occurs)"""
+        config = {
+            "openmetrics_endpoint": "http://openmetrics.example.com:8080/metrics",
+            "prometheus_url": "http://prometheus.example.com:9090/metrics",
+        }
+
+        # This should not raise an exception and prometheus_url should not be overwritten
+        # The mapping should NOT occur when both are present
+        result = initialize_instance(config)
+        assert result["openmetrics_endpoint"] == "http://openmetrics.example.com:8080/metrics"
+        assert result["prometheus_url"] == "http://prometheus.example.com:9090/metrics"  # Should remain unchanged
+
+    def test_no_endpoints(self):
+        """Test that validation fails when neither endpoint is provided"""
+        config = {}
+
+        # This should raise a ValueError
+        with pytest.raises(ValueError, match="Field `openmetrics_endpoint` or `prometheus_url` must be set"):
+            initialize_instance(config)