[Feat]: streaming charts are missing

[ktsaou]

Problem

We don't have any visibility of how streaming works in netdata.

Description

We need to monitor how streaming works.

Importance

must have

Value proposition

Have charts to show the performance of the streaming protocol.

Proposed implementation

In the section Netdata Monitoring there should be charts about streaming:

Children connections

1. netdata.streaming.children.connections

   • connects, counts the number of streaming connections received
   • disconnects, counts the number of streaming disconnections

2. netdata.streaming.children.rejections

   • one dimension per reason of rejection

3. netdata.streaming.children.live

   • live, the number of currently connected child nodes

4. netdata.streaming.children.live_by_version

   • one dimension for every version of the protocol

5. netdata.streaming.children.bandwidth

   • received, the amount of traffic we receive from children
   • sent, the amount of traffic we sent to children

6. netdata.streaming.children.commands

   • CHART, the number of charts defined (CHART command)
   • DIMENSION, the number of dimensions defined (DIMENSION command)
   • SET, the number of points received (SET command)
   • etc for the rest of the plugins.d protocol commands

7. netdata.streaming.children.cpu

   • user cpu utilization of all children threads
   • system cpu utilization of all children threads

Parent connections

Most children charts can also be created for parents:

1. netdata.streaming.parents.connections
2. netdata.streaming.parents.live
3. netdata.streaming.parents.bandwidth
4. netdata.streaming.parents.commands
5. netdata.streaming.parents.cpu

Additionally:

6. netdata.streaming.parents.overflows - counts the number of buffer overflows