Delay pmon non-critical daemon (sonic-net#18907)

- Why I did it
After this pull request sonic-net#19190 , the pmon has been added to the start list in fast/warm reboot scenarios. However, certain non-critical daemons of pmon could be delayed, resulting in a saving of approximately 1 second in the reboot process. For performance considerations, especially as the current time usage of fast reboot is closer to 30 seconds limitation, this change could ease the pressure.

- How I did it
add a script as fast/warm reboot monitor and relative supervisord rlues.
once the script exited means the reboot process has ended, other delayed daemon would then initialize.

- How to verify it
check the fast/warm reboot time usage

Signed-off-by: Yuanzhe, Liu <yualiu@nvidia.com>

Author: yuazhe

device/mellanox/x86_64-mlnx_msn2700-r0/pmon_daemon_control.json

@@ -2,6 +2,7 @@
     "skip_ledd": true,
     "skip_fancontrol": true,
     "delay_xcvrd": true,
-    "skip_xcvrd_cmis_mgr": true
+    "skip_xcvrd_cmis_mgr": true,
+    "delay_non_critical_daemon": true
 }
 

dockers/docker-platform-monitor/delay.py

@@ -0,0 +1,7 @@
+#!/usr/bin/env python3
+
+# This file serves as a monitor for advanced reboot. 
+# Once it exits, the delayed daemon will initiate.
+
+from swsscommon.swsscommon import RestartWaiter
+RestartWaiter.waitAdvancedBootDone()

dockers/docker-platform-monitor/docker-pmon.supervisord.conf.j2

@@ -28,6 +28,16 @@ stdout_logfile=syslog
 stderr_logfile=syslog
 dependent_startup=true
 
+
+{% if delay_non_critical_daemon %}
+[program:delay]
+command=python3 /usr/bin/delay.py
+autostart=false
+autorestart=false
+startsecs=0
+dependent_startup=true
+{% endif %}
+
 {% if not skip_chassisd and (IS_MODULAR_CHASSIS == 1 or is_smartswitch) %}
 [program:chassisd]
 command=/usr/local/bin/chassisd
@@ -64,7 +74,7 @@ stdout_logfile=syslog
 stderr_logfile=syslog
 startsecs=0
 dependent_startup=true
-dependent_startup_wait_for=rsyslogd:running
+dependent_startup_wait_for=rsyslogd:running {% if delay_non_critical_daemon %}delay:exited{% endif %}
 {% endif %}
 
 {% if not skip_fancontrol and HAVE_FANCONTROL_CONF == 1 %}
@@ -151,7 +161,7 @@ stdout_logfile=syslog
 stderr_logfile=syslog
 startsecs=10
 dependent_startup=true
-dependent_startup_wait_for=rsyslogd:running
+dependent_startup_wait_for=rsyslogd:running {% if delay_non_critical_daemon %}delay:exited{% endif %}
 {% endif %}
 
 {% if not skip_syseepromd %}
@@ -164,7 +174,7 @@ stdout_logfile=syslog
 stderr_logfile=syslog
 startsecs=10
 dependent_startup=true
-dependent_startup_wait_for=rsyslogd:running
+dependent_startup_wait_for=rsyslogd:running {% if delay_non_critical_daemon %}delay:exited{% endif %}
 {% endif %}
 
 {% if not skip_thermalctld %}
@@ -178,7 +188,7 @@ stderr_logfile=syslog
 startsecs=10
 startretries=50
 dependent_startup=true
-dependent_startup_wait_for=rsyslogd:running
+dependent_startup_wait_for=rsyslogd:running {% if delay_non_critical_daemon %}delay:exited{% endif %}
 {% endif %}
 
 {% if not skip_pcied %}
@@ -191,7 +201,7 @@ stdout_logfile=syslog
 stderr_logfile=syslog
 startsecs=10
 dependent_startup=true
-dependent_startup_wait_for=rsyslogd:running
+dependent_startup_wait_for=rsyslogd:running {% if delay_non_critical_daemon %}delay:exited{% endif %}
 {% endif %}
 
 {% if include_sensormond %}
@@ -204,7 +214,7 @@ stdout_logfile=syslog
 stderr_logfile=syslog
 startsecs=10
 dependent_startup=true
-dependent_startup_wait_for=rsyslogd:running
+dependent_startup_wait_for=rsyslogd:running {% if delay_non_critical_daemon %}delay:exited{% endif %}
 {% endif %}
 
 {% if not skip_stormond %}