The step named "Send issue notifications" in Compute Engine can be very long when processing an analysis report. Duration can be displayed in logs/ce.log by enabling DEBUG logs (set sonar.log.level.ce=DEBUG in conf/sonar.properties). Example of log :
Hotspot comes from repeated executions of a slow SQL request. Fixing the algorithm is out-of-scope of this ticket, however the SQL request can be much improved (from 2 seconds to few ms).