tekton: use named metrics port for discovery

Author: vitkyrka

tekton/assets/configuration/spec.yaml

@@ -4,11 +4,12 @@ files:
 - name: tekton.yaml
   discovery:
     strategies:
-    - strategy: from_ports
-      port_hints:
-      - 9090
-      candidates:
-      - pipelines_controller_endpoint: "http://{service.host}:{port.number}/metrics"
+    - template: discovery/openmetrics_from_named_ports
+      overrides:
+        port_names:
+        - metrics
+        candidates:
+        - pipelines_controller_endpoint: "http://{service.host}:{port.number}/metrics"
   options:
   - template: init_config
     options:

tekton/datadog_checks/tekton/config_models/discovery.py

@@ -12,7 +12,7 @@
 from collections.abc import Iterator
 from typing import Any
 
-from datadog_checks.base.utils.discovery import Service, candidate_ports
+from datadog_checks.base.utils.discovery import Service, candidate_ports_by_name
 from datadog_checks.tekton.config_models import discovery_overrides
 from datadog_checks.tekton.config_models.instance import InstanceConfig
 from datadog_checks.tekton.config_models.shared import SharedConfig
@@ -22,8 +22,8 @@ def _generated_candidates(service: Service) -> Iterator[dict[str, Any]]:
     shared = SharedConfig.model_validate({}, context={'configured_fields': frozenset()}).model_dump(
         by_alias=True, mode='json', exclude_none=True
     )
-    # discovery[0]: from_ports
-    for port in candidate_ports(service, [9090]):
+    # discovery[0]: from_named_ports
+    for port in candidate_ports_by_name(service, ['metrics']):
         ctx = {'port': port}
         instance_data = {
             'pipelines_controller_endpoint': 'http://{service.host}:{port.number}/metrics'.format(