References 

Glossary 

Check-in
A status message sent for one execution of a Sentry cron monitor. This extension uses in_progress, ok, and error.
Cron monitor
A Sentry object that records expected task schedules and executions. It can detect failures and missed executions.
DSN
Data Source Name. It identifies the Sentry host and project used by the initialized Sentry SDK.
Issue alert rule
A Sentry rule that matches events and executes an action. This extension creates a rule that sends matching monitor failures to Microsoft Teams.
Monitor slug
Machine-readable monitor identifier used by the generated alert filter.
Scheduler task
A TYPO3 task configured for one-time or recurring execution by the Scheduler system extension.
XCLASS
TYPO3 mechanism that replaces an instantiated class with a subclass. This extension uses it to wrap central Scheduler execution.

Behavior reference 

Condition Behavior
Context is not Production Run the task without Sentry monitoring.
Sentry host is unreachable Run the task without Sentry monitoring.
Task returns true Send an ok check-in.
Task returns false Send an error check-in.
Task throws an exception Send an error check-in and preserve the exception.
Matching alert rule exists Reuse it.
Matching alert rule does not exist Create a Microsoft Teams issue alert rule.

External documentation