LoggiFly is a lightweight “log → alert” daemon for Docker: it watches container logs for keywords/regex (including multi-line patterns) and immediately notifies you (ntfy, or basically anything via Apprise). It has real traction (about 1.7k GitHub stars and active releases) and it targets a common pain point: you don’t want a full observability stack just to catch “failed login”, “error”, “panic”, or crash-loop spam the moment it happens. Typical users: self-hosters, homelabbers, and small teams running multiple containers who want fast alerts and optional actions (restart/stop) without heavyweight setup.