Web developer, and sometimes Linux or admin. I work mostly with PHP and Symfony, not so often with JavaScript / Typescript with React or Vue. And when I have time, I'm trying to get into mobile apps.
Sentry: online version or selfhosted, for error handling. It does a great job capturing exceptions, showing all the exception trace and not duplicating it if it happens more than one time.
Jenkins: monitoring tests and staging server deployment output.
Zabbix: monitoring almost all other things: servers availability via ping, server processes uptime and performance with templates, backups output, web sites response code and time, periodic background processes being executed, etc.
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In my company and my personal projects, I use: