[CONTP-382] Add Validation Webhook telemetry metrics (#18867)

* Add Validation Webhook telemetry

* Updating webhooks_receieved description

Author: gabedos

datadog_cluster_agent/changelog.d/18867.added

@@ -0,0 +1 @@
+Add telemetry scraping for Validation AdmissionController

datadog_cluster_agent/datadog_checks/datadog_cluster_agent/check.py

@@ -11,6 +11,7 @@
     'admission_webhooks_library_injection_attempts': 'admission_webhooks.library_injection_attempts',
     'admission_webhooks_library_injection_errors': 'admission_webhooks.library_injection_errors',
     'admission_webhooks_mutation_attempts': 'admission_webhooks.mutation_attempts',
+    'admission_webhooks_validation_attempts': 'admission_webhooks.validation_attempts',
     'admission_webhooks_patcher_attempts': 'admission_webhooks.patcher.attempts',
     'admission_webhooks_patcher_completed': 'admission_webhooks.patcher.completed',
     'admission_webhooks_patcher_errors': 'admission_webhooks.patcher.errors',

datadog_cluster_agent/metadata.csv

@@ -17,7 +17,8 @@ datadog.cluster_agent.admission_webhooks.reconcile_errors,gauge,,,,Number of rec
 datadog.cluster_agent.admission_webhooks.reconcile_success,gauge,,success,,Number of reconcile successes per controller,0,datadog_cluster_agent,admission webhooks reconcile success,
 datadog.cluster_agent.admission_webhooks.response_duration.count,count,,,,Webhook response duration count,0,datadog_cluster_agent,webhook response duration count,
 datadog.cluster_agent.admission_webhooks.response_duration.sum,count,,second,,Webhook response duration sum,0,datadog_cluster_agent,webhook response duration sum,
-datadog.cluster_agent.admission_webhooks.webhooks_received,gauge,,,,Number of mutation webhook requests received,0,datadog_cluster_agent,admission webhooks received,
+datadog.cluster_agent.admission_webhooks.validation_attempts,gauge,,,,Number of pod validation attempts by validation type,0,datadog_cluster_agent,admission webhooks validation attempts,
+datadog.cluster_agent.admission_webhooks.webhooks_received,gauge,,,,Number of webhook requests received,0,datadog_cluster_agent,admission webhooks received,
 datadog.cluster_agent.aggregator.flush,count,,,,"Number of metrics/service checks/events flushed by (data_type, state)",0,datadog_cluster_agent,aggregator flush,
 datadog.cluster_agent.aggregator.processed,count,,,,Amount of metrics/services_checks/events processed by the aggregator by data_type,0,datadog_cluster_agent,aggregator processed,
 datadog.cluster_agent.api_requests,count,,request,,"Requests made to the cluster agent API by (handler, status)",0,datadog_cluster_agent,api requests,

datadog_cluster_agent/tests/fixtures/metrics.txt

@@ -11,6 +11,9 @@ admission_webhooks_mutation_attempts{error="",injected="true",mutation_type="age
 admission_webhooks_mutation_attempts{error="",injected="true",mutation_type="agent_sidecar",status="success"} 1
 admission_webhooks_mutation_attempts{error="",injected="true",mutation_type="cws_pod_instrumentation",status="success"} 2
 admission_webhooks_mutation_attempts{error="",injected="true",mutation_type="lib_injection",status="success"} 1
+# HELP admission_webhooks_validation_attempts Number of pod validation attempts by validation type
+# TYPE admission_webhooks_validation_attempts gauge
+admission_webhooks_validation_attempts{error="",validated="true",webhook_name="kubernetes_audit",status="success"} 1
 # HELP admission_webhooks_reconcile_errors Number of reconcile errors per controller.
 # TYPE admission_webhooks_reconcile_errors gauge
 admission_webhooks_reconcile_errors{controller="secrets"} 5
@@ -34,7 +37,7 @@ admission_webhooks_response_duration_bucket{le="10"} 108
 admission_webhooks_response_duration_bucket{le="+Inf"} 108
 admission_webhooks_response_duration_sum 0.4897835529999999
 admission_webhooks_response_duration_count 108
-# HELP admission_webhooks_webhooks_received Number of mutation webhook requests received.
+# HELP admission_webhooks_webhooks_received Number of webhook requests received.
 # TYPE admission_webhooks_webhooks_received gauge
 admission_webhooks_webhooks_received 300
 # HELP aggregator__dogstatsd_contexts Count the number of dogstatsd contexts in the aggregator

datadog_cluster_agent/tests/test_datadog_cluster_agent.py

@@ -21,6 +21,7 @@
     'admission_webhooks.library_injection_attempts',
     'admission_webhooks.library_injection_errors',
     'admission_webhooks.mutation_attempts',
+    'admission_webhooks.validation_attempts',
     'admission_webhooks.patcher.attempts',
     'admission_webhooks.patcher.completed',
     'admission_webhooks.patcher.errors',