One Go binary, one YAML file, one SQLite database: I wrote my monitoring tool

The author created Gjallar, a lightweight monitoring tool built as a single Go binary with a YAML config file and SQLite database, to monitor diverse services (HTTP endpoints, databases, Redis, etc.) without operating an entire monitoring platform. The tool achieves simplicity through pure-Go dependencies that eliminate external C libraries, enabling easy deployment via a self-contained 36MB binary, and uses a lock-free architecture where each monitor runs in its own goroutine sending results to a single consumer, avoiding concurrency complexity.