Collect сore components

[ekazachkova]

This PR brings an ability to collect core components - core pods with description if required.

• a new cloud-pipeline/core-component=<kind> label shall be added to each core pod. This label indicates that concrete pod shall be considered as core pod. The value shall be equal to pods highest owner kind (Deployment/StatefulSet/...).
• this label shall be added to cluster.kube.core.component.label system preference

• a new API method shall be implemented:

  1. Load core components GET /cluster/pods/core

Response: <pod description as for cluster/node/<…>/load> ...

• parentType - owner's type (Deployment/StatefulSet/CronJob/...)
• parentName - owner's name (cp-api-srv/cp-vm-monitor/...)
• status
  • reason
  • message
  • timestamp # pod's start timestamp
• containers <container description as for cluster/node/<…>/load> ...
  • restartCount
  • lastRestartStatus (interface as for status field)
    2. Load pod description GET cluster/pods/info?podId=<podID>&detailed=<true/false>
• podId - the pod's name [required]
• detailed - flag that indicates full pod info loading [default: false] Response:
• events: # list of objects
  • type
  • reason
  • message
• description # string that contains pod info description; returns if detailed=true only
  3. Load container logs GET cluster/containers/logs?podId=<>&containerId=<>&limit=<>
• podId - the pod's name [required]
• containerId - the container name [required]
• limit - the number of lines to return [default: value from system.log.line.limit system preference]

All methods shall be available for ADMIN role only.