[MESOS-10117] Update the `usage()` method of containerizer to set resource limits in the `ResourceStatistics` protobuf message

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.10.0
• Component/s: containerization
• Target Version/s: 1.10.0
• Epic Link: Resource Limits/Requests
• Sprint: Studio 1: RI-23 68
• Story Points: 3
• Assignee: Qian Zhang
• Reporter: Qian Zhang
• Created: 15/Apr/20 12:56
• Updated: 05/May/20 08:17
• Resolved: 05/May/20 08:17

Description

In the `ResourceStatistics` protobuf message, there are a couple of issues:

1. There are already `cpu_limit` and `mem_limit_bytes` fields, but they are actually CPU & memory requests when resources limits are specified for a task.
2. There is already `mem_soft_limit_bytes` field, but this field seems not set anywhere.

So we need to update this protobuf message and also the related containerizer code which set the fields of this protobuf message.