Monitor a file for changes and send an alert

Description

This flow monitors a file for changes of its content. If changed, an alert is sent out and you receive it as push, SMS or voice call on SIGNL4.

User cases:
Log-file monitoring
Monitoring of production data
Integration with third-party systems via file interface
Etc.

Sample file "alert-data.json":
{
"Body": "Alert in building A2.",
"Done": false,
"eventId": "2518088743722201372_4ee5617b-2731-4d38-8e16-e4148b8fb8a0"
}

Body: The alert text to be sent.
Done: If false this is a new alert. If true this indicated the alert has been closed.
eventId: Last SIGNL4 event ID written by SIGNL4.

This flow can be easily adapted for database monitoring as well.