fix(notifications): Send notification on explicit recording stop

[jan-law]

Fixes #780

[jan-law]

Itests failed with the following errors. Seems related to #716 and #666

INFO: (10.0.2.100:59594): PATCH /api/v1/targets//service:jmx:rmi:%2F%2F%2Fjndi%2Frmi:%2F%2Fcryostat-itests:9091%2Fjmxrmi/recordings/someRecording 204 232ms
Jan 14, 2022 10:26:04 PM io.cryostat.core.log.Logger error
SEVERE: HTTP 500: io.cryostat.recordings.EmptyRecordingException: java.io.IOException: java.io.IOException: No recording data available
io.vertx.ext.web.handler.impl.HttpStatusException: Internal Server Error
Caused by: java.util.concurrent.ExecutionException: io.cryostat.recordings.EmptyRecordingException: java.io.IOException: java.io.IOException: No recording data available

Jan 14, 2022 10:26:10 PM io.cryostat.core.log.Logger info
INFO: io.cryostat.net.reports.SubprocessReportGenerator adjusting subprocess OOM score
Jan 14, 2022 10:26:10 PM io.cryostat.core.log.Logger info
INFO: io.cryostat.net.reports.SubprocessReportGenerator processing report
java.lang.NullPointerException
	at org.openjdk.jmc.flightrecorder.parser.synthetic.SyntheticAttributeExtension$ModuleExportSink.addEvent(SyntheticAttributeExtension.java:206)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager$EventTypeEntry.readEvent(TypeManager.java:318)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.readEvent(TypeManager.java:406)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.ChunkLoaderV1.call(ChunkLoaderV1.java:91)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.ChunkLoaderV1.call(ChunkLoaderV1.java:47)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)
Jan 14, 2022 10:26:11 PM io.cryostat.core.log.Logger error
SEVERE: Exception thrown
io.cryostat.net.reports.SubprocessReportGenerator$SubprocessReportGenerationException: [6] An unspecified unexpected exception occurred.
	at io.cryostat.net.reports.SubprocessReportGenerator.lambda$exec$0(SubprocessReportGenerator.java:141)
	at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1700)
	at java.base/java.lang.Thread.run(Thread.java:829)

[andrewazores]

nevermind