pmon docker - Enable config of thermalctd polling interval

[lotus-nexthop]

Platforms can now configure thermal monitor intervals in their pmon_daemon_control.json:

# example
{
    "thermalctld": {
        "thermal_monitor_initial_interval": 5,
        "thermal_monitor_update_interval": 30,
        "thermal_monitor_update_elapsed_threshold": 25
    }
}

Note this only affects the ThermalMonitor thread in the thermalctld daemon.
ThermalMonitor's role is to poll fan and temperature sensors from hardware and publish information to redis.
This redis values are used in show platform temperature and show platform fan for example.

Parameter Details

thermal_monitor_initial_interval

• Purpose: The initial time to wait before the first poll by ThermalMonitor on thermalctld startup.
• Default: 5 seconds

thermal_monitor_update_interval

• Purpose: Every thermal_monitor_update_interval seconds, the hardware is polled
• Default: 60 seconds

thermal_monitor_update_elapsed_threshold

• Purpose: If it takes longer than thermal_monitor_update_elapsed_threshold seconds to poll hardware (collected information from all fans and temperature sensors), a warning is logged.
• Default: 30 seconds

Why I did it

The default polling interval of 60s is quite high and feels unresponsive (i.e. an operator can remove a fan and wait nearly a minute for show plat fan to update).

How I did it

In sonic-net/sonic-platform-daemons#635 we made these intervals configurable.

This PR updates the jinja template to handle these new configuration options.

It decreases the update interval from 60s -> 10s for NH-4010. I'm aiming for a balance of responsiveness without polling excessively.

Example usage of these feature:
https://github.com/nexthop-ai/private-sonic-buildimage/blob/master/device/nexthop/common/pmon_daemon_control.json

How to verify it

Verified on NH-4010 that thermalctld is being run with the expected options.

Which release branch to backport (provide reason below if selected)

• 202205
• 202211
• 202305
• 202311
• 202405
• 202411
• 202505

Tested branch (Please provide the tested image version)

Description for the changelog

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

[mssonicbld]

/azp run Azure.sonic-buildimage

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[lotus-nexthop]

cc @judyjoseph

[judyjoseph]

LGTM, but please add details in PR description on the new intervals and which daemon/thread in thermalctld it will affect

[lotus-nexthop]

Thanks @judyjoseph , I have updated the PR description to document this, please take a look.

[judyjoseph]

/azpw ms_conflict

[judyjoseph]

@rlhui could you help merge this PR