1.19.4

• #2527 Fix: [Docker Monitor] Incorrect handling for container down (Thanks @chakflying)
• #2528 Fix: Add tag issue (Thanks @chakflying)
• #2569 Fix: Add validation of Keep Monitor History Days (Thanks @Computroniks)
• #2223 Improvement: Better support for ping monitor on different Linux distros (Thanks @Computroniks)
• #2543 Improvement: Remove redundant title in Pushover notification (Thanks @SlothCroissant)
• Docker: Update Apprise from 1.2.0 to 1.2.1 (Changelog)

Thank you all contributors! Bug fix, code refactoring, language files update, code review and more!
(Let me know if I forget to add your name if your pull request have been merged in this version)
@furkanipek @SirMorfield @Computroniks @deluxghost @MrEddX @DimitriDR