Monitor systemd with Datadog

Systemd is an initialization program that manages processes on Linux systems, designed to improve performance by creating a dependency tree of system components and using parallelization. Datadog's new integration with systemd provides comprehensive visibility into system management within Linux deployments. The integration includes detailed metrics for the status of units managed by systemd, such as active, activating, inactive, deactivating, and failed units over time. It also offers an out-of-the-box dashboard for systemd that surveys per-unit metrics across infrastructure, with a focus on commonly used units like cron, SSH, and syslog. Additionally, the integration runs service checks to report unit health statuses and detect if Datadog can no longer connect to systemd or if systemd is unavailable. Users can set alerts for critical statuses. The integration also helps in visualizing per-unit resource consumption over time, enabling users to understand typical usage levels and set reasonable limits.