Add charm options to configure guages for ovn-controller

[Hemanth Nakkina]

Add a new configuration option ovn-remote-probe-interval

ovn-controller might have the following logs due to scaling issues when the processing of logical flows takes > 5s

Following logs can be observed on ovn-controller

2022-02-17T04:37:50.941Z|368641|timeval|WARN|Unreasonably long 27886ms poll interval (27242ms user, 616ms system)

Command to set the ovn-remote-probe-interval
ovs-vsctl set open . external_ids:ovn-remote-probe-interval=<value>

EDIT: Modified the bug subject line to add 2 more new params
ovn-monitor-all and ovn-openflow-probe-interval

[Frode Nordahl (fnordahl)]

Thank you for your bug report, Hemanth.

While I can agree with the need for configuring the probe interval for the connection between the ``ovn-controller`` and the OVN Southbound Database, I question the connection with the "Unreasonably long poll interval" log message.

This message is logged whenever any ovn-controller main loop operation takes too long regardless of cause.

If the probe interval timer is in fact hit, would you not see SB DB re-connections?

[Hemanth Nakkina (hemanth-n)]

Hi Frode

yes, i see the re-connections happening

2022-02-17T04:45:43.581Z|368807|reconnect|WARN|ssl:<IP>:6642: connection dropped (Broken pipe)
2022-02-17T04:45:44.582Z|368808|poll_loop|INFO|wakeup due to 1001-ms timeout at lib/reconnect.c:664 (100% CPU usage)
2022-02-17T04:45:44.583Z|368809|reconnect|INFO|ssl:<IP>:6642: connecting...
2022-02-17T04:45:44.587Z|368811|reconnect|INFO|ssl:<IP>:6642: connected
2022-02-17T04:50:29.333Z|368897|reconnect|WARN|ssl:<IP>:6642: connection dropped (Broken pipe)
2022-02-17T04:50:30.333Z|368899|poll_loop|INFO|wakeup due to 984-ms timeout at lib/reconnect.c:664 (100% CPU usage)
2022-02-17T04:50:30.333Z|368900|reconnect|INFO|ssl:<IP>:6642: connecting...
2022-02-17T04:50:30.346Z|368902|reconnect|INFO|ssl:<IP>:6642: connected

[Alin-Gabriel Serdean (alin-serdean)]

Hi,

It would be also nice to have the following two options as gauges:
ovn-monitor-all (1)
ovn-openflow-probe-interval (2)

(1) https://github.com/ovn-org/ovn/blob/branch-20.03/controller/ovn-controller.8.xml#L106
(2) https://github.com/ovn-org/ovn/blob/branch-20.03/controller/ovn-controller.8.xml#L141