It's actually a bug in alarm notifier - it does not update alarm list correctly.
For knowing that node was offline for some time and then go back online, you can do the following:
Instead of terminating node down alarm when SYS_NODE_UP event received, generate new alarm with NORMAL priority which will replace "Node down" alarm. Than you will know that node was down for some time. Then you have 3 options to terminate those "Node up" alarms:
1. Terminate them manually;
2. Create a script that will use nxalarm command line utility to periodically read active alarms and terminate "Node up" alarms which are older than some time period;
3. Set alarm timeout for "Node up" alarms and terminate them when alarm timeout event comes.
Best regards,
Victor
For knowing that node was offline for some time and then go back online, you can do the following:
Instead of terminating node down alarm when SYS_NODE_UP event received, generate new alarm with NORMAL priority which will replace "Node down" alarm. Than you will know that node was down for some time. Then you have 3 options to terminate those "Node up" alarms:
1. Terminate them manually;
2. Create a script that will use nxalarm command line utility to periodically read active alarms and terminate "Node up" alarms which are older than some time period;
3. Set alarm timeout for "Node up" alarms and terminate them when alarm timeout event comes.
Best regards,
Victor