Cloudprober

Cloudprober is an open-source active monitoring tool that probes systems and services to detect failures before users encounter them. It runs as a single binary and can be deployed on hardware ranging from small devices to large distributed fleets. The tool includes built-in probes for HTTP, gRPC, DNS, PING, TCP, UDP, and browser-based testing, allowing developers to monitor multiple layers of their infrastructure and applications simultaneously. It supports custom probes through external scripts, Starlark configuration, or Go extensions for cases where built-in options are insufficient.

Cloudprober integrates with observability platforms including Prometheus, Datadog, and Google Cloud Monitoring, and can send alerts through PagerDuty, OpsGenie, Slack, and other channels. Configuration uses a templated format that supports auto-discovery and dynamic target management. The tool is developed by cloudprober and released under the Apache 2.0 license.