node events

The basic format of the event MONROE.META.NODE.EVENT follows the following syntax:

  ''MONROE.META.NODE.EVENT <JSON>''

With the JSON dictionary containing these fields:

• EventType
• Timestamp
• SequenceNumber
• DataId
• DataVersion

Messages can also be sent using the command line utility sysevent

It accepts a number of JSON dictionaries on stdin, and will send one event message per line of input to the metadata exporter. All of the above field, but the EventType, will be added by the metadata exporter.

Implemented events

The following messages and events are implemented in the MONROE nodes:

EventType	Meaning	Extra keys
Watchdog.Failed	The system watchdog detected an error symptom	message
Watchdog.Repaired	The system watchdog resolved the issue	message
Watchdog.Status	Periodic status messages from the watchdog	message
Maintenance.Start	An interactive login on the node is registered	user
Maintenance.Stop	The interactive login session is closed	user
System.Halt	System halt is requested
Scheduling.Started	The node starts to query the scheduling server

Requested events

The following messages and events are requested (work in progress, consider these examples):

EventType	Meaning	Extra keys
Scheduling.Stopped	The node stops to query the scheduling server, no new experiments are scheduled
Scheduling.Aborted	All running experiments are about to be stopped, the node is in maintenance mode