We are using pipelines cluster pools for our CI of task repos. When there is more than one task is running parallel then job fails as there is no cluster available to claim.
Solution is to increase the number of clusters and also check if changing the values of `runningCount` or `size` can help.
https://github.com/openshift/release/blob/master/clusters/hosted-mgmt/hive/pools/pipelines/pipelines-ocp-4-14-0-amd64-openstack-clusterpool.yaml#L34 

Configuration is present at https://github.com/openshift/release/tree/master/clusters/hosted-mgmt/hive/pools/pipelines 

Example failed job: https://storage.googleapis.com/test-platform-results/pr-logs/pull/openshift-pipelines_task-maven/35/pull-ci-openshift-pipelines-task-maven-main-osp-114-ocp-415-e2e/1836023067923451904/build-log.txt