add Throttling metrics to Pipelines Grafana Dashboard

    The following metrics are added to the Dashboard:
    1. tekton_pipelines_controller_running_taskruns_throttled_by_quota_count - Number of taskruns executing currently, but whose underlying Pods or Containers are suspended by k8s because of defined ResourceQuotas. Such suspensions can occur as part of initial scheduling of the Pod, or scheduling of any of the subsequent Container(s) in the Pod after the first Container is started
    2. tekton_pipelines_controller_running_taskruns_throttled_by_node_count - Number of taskruns executing currently, but whose underlying Pods or Containers are suspended by k8s because of Node level constraints. Such suspensions can occur as part of initial scheduling of the Pod, or scheduling of any of the subsequent Container(s) in the Pod after the first Container is started

Signed-off-by: Satyam Bhardwaj <[email protected]>

Author: Satyam Bhardwaj