feat: Implement metrics for topic

[rekby]

in package metrics.

May be split to two tickets: reader and writer.

Reader:

• [ ] Buffer limit (in bytes)
• [ ] Buffer usage (in bytes, in messages)
• [ ] Count of assigned partitions
• [ ] Count of readed messages
• [ ] Count of Sent commits
• [ ] Count of received commit acks
• [ ] Time for receive commit ack (histogram)
• [ ] Time for read batch from reader (histogram)
• [ ] Count of read operations from reader
• [ ] Count of connections to server

Writer:

• [ ] Buffer limit (in bytes)
• [ ] Buffer usage (in bytes, in messages)
• [ ] Sent messages (in bytes and count)
• [ ] Count of calls Write method
• [ ] Count of connections to server
• [ ] Time for receive message ack (histogram)
• [ ] Time for compress message (histogram)
• [ ] Total time for compress messages (summary, seconds)
• [ ] Message compress ratio

[orloffv]

any plans for this issue?

[rekby]

Hello. The metrics needs, and the issue will be done. But I can't say about schedule.