jenkins: spread ci agents and cap concurrency

Jenkinsfile

@@ -31,6 +31,13 @@ spec:
                   - titan-15
                   - titan-17
                   - titan-19
+  topologySpreadConstraints:
+    - maxSkew: 1
+      topologyKey: kubernetes.io/hostname
+      whenUnsatisfiable: ScheduleAnyway
+      labelSelector:
+        matchLabels:
+          jenkins/jenkins-jenkins-agent: "true"
   containers:
     - name: jnlp
       image: jenkins/inbound-agent:3355.v388858a_47b_33-2-jdk21

ci/Jenkinsfile.titan-iac

@@ -30,6 +30,13 @@ spec:
                   - titan-15
                   - titan-17
                   - titan-19
+  topologySpreadConstraints:
+    - maxSkew: 1
+      topologyKey: kubernetes.io/hostname
+      whenUnsatisfiable: ScheduleAnyway
+      labelSelector:
+        matchLabels:
+          jenkins/jenkins-jenkins-agent: "true"
   containers:
     - name: jnlp
       image: jenkins/inbound-agent:3355.v388858a_47b_33-2-jdk21

services/jenkins/configmap-jcasc.yaml

@@ -468,7 +468,7 @@ data:
         plainText
       clouds:
       - kubernetes:
-          containerCapStr: "10"
+          containerCapStr: "4"
           connectTimeout: "20"
           readTimeout: "90"
           jenkinsUrl: "http://jenkins.jenkins.svc.cluster.local:8080"

services/logging/Jenkinsfile.data-prepper

@@ -29,6 +29,13 @@ spec:
                   - titan-15
                   - titan-17
                   - titan-19
+  topologySpreadConstraints:
+    - maxSkew: 1
+      topologyKey: kubernetes.io/hostname
+      whenUnsatisfiable: ScheduleAnyway
+      labelSelector:
+        matchLabels:
+          jenkins/jenkins-jenkins-agent: "true"
   containers:
     - name: git
       image: alpine/git:2.47.1