Enable sairedis counter thread in 3 minutes after SONiC was started

files/build_templates/enable_counters.service

@@ -0,0 +1,7 @@
+[Unit]
+Description=Enable SONiC counters
+
+[Service]
+Type=oneshot
+ExecStart=/bin/bash -c '/usr/bin/counterpoll queue enable ; /usr/bin/counterpoll port enable ; /usr/bin/pfcwd counter_poll enable'
+RemainAfterExit=yes

files/build_templates/enable_counters.timer

@@ -0,0 +1,9 @@
+[Unit]
+Description=Delays the SONiC counters gathering until SONiC has started
+
+[Timer]
+OnBootSec=3min
+Unit=enable_counters.service
+
+[Install]
+WantedBy=timers.target

files/build_templates/snmp.service.j2

@@ -1,12 +1,9 @@
 [Unit]
 Description=SNMP container
-Requires=updategraph.service swss.service
-After=updategraph.service swss.service
+Requires=updategraph.service swss.service enable_counters.service
+After=updategraph.service swss.service enable_counters.service
 
 [Service]
 ExecStartPre=/usr/bin/{{docker_container_name}}.sh start
 ExecStart=/usr/bin/{{docker_container_name}}.sh attach
 ExecStop=/usr/bin/{{docker_container_name}}.sh stop
-
-[Install]
-WantedBy=multi-user.target

files/build_templates/snmp.timer

@@ -0,0 +1,9 @@
+[Unit]
+Description=Delays snmp container until SONiC has started
+
+[Timer]
+OnBootSec=3min 30 sec
+Unit=snmp.service
+
+[Install]
+WantedBy=timers.target

files/build_templates/sonic_debian_extension.j2

@@ -272,6 +272,14 @@ sudo LANG=C chroot $FILESYSTEM_ROOT fuser -km /sys || true
 sudo LANG=C chroot $FILESYSTEM_ROOT umount -lf /sys
 {% endif %}
 
+# Copy systemd timer configuration
+# It implements delayed start of services
+sudo cp $BUILD_TEMPLATES/enable_counters.timer $FILESYSTEM_ROOT/etc/systemd/system/
+sudo cp $BUILD_TEMPLATES/enable_counters.service $FILESYSTEM_ROOT/etc/systemd/system/
+sudo cp $BUILD_TEMPLATES/snmp.timer $FILESYSTEM_ROOT/etc/systemd/system/
+sudo LANG=C chroot $FILESYSTEM_ROOT systemctl enable enable_counters.timer
+sudo LANG=C chroot $FILESYSTEM_ROOT systemctl enable snmp.timer
+
 sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get remove -y python-dev 
 sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get clean -y
 sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get autoremove -y