[Alerta-Mailer] Integration failed with Jinja2 Autoescape extension deprecation

[mirzacodes]

Issue Summary
I am working with Alerta Mailer Integration, however, I have recently faced an issue. The alerta-mailer integration is failing with deprecation of jinja2 extension autoescape. I am attaching screenshot below from the logs.

Below link also shows documentation of this issue. This extension has been removed from the jinja2 version 3.0.0+ and it is built-on now.

• https://stackoverflow.com/a/72706572
• https://jinja.palletsprojects.com/en/3.1.x/changes/#version-3-0-0

Proposed fix
This issue can be fixed by removing the 'autoescape' extension from the code line.

alerta-contrib/integrations/mailer/mailer.py

Line 173 in 4ba3682

extensions=['jinja2.ext.autoescape'],