This is a Prometheus exporter for NATS server monitoring. It polls NATS server HTTP monitoring endpoints (varz, connz, subz, routez, healthz, jsz, etc.) and exposes metrics in Prometheus format. The architecture is a standalone binary with an embeddable library API. Key entry points are the CLI (main.go) and the exporter.NewExporter function. Data flow: on each scrape, collectors make HTTP requests to NATS monitoring endpoints, parse JSON responses, and convert them to Prometheus gauge metrics. The exporter supports TLS, basic auth, custom metric prefixes, and multiple NATS servers (though one per exporter is recommended). It includes pre-built Grafana dashboards for both NATS core and JetStream metrics. The codebase is well-structured with separate packages for collectors, exporter, and test utilities. It uses reflection-based metric extraction for simple endpoints and custom collectors for complex ones like JetStream, connections, and gateways. The project is actively maintained with recent commits and modern dependencies.
SQLWATCH is a SQL Server performance monitoring solution designed for self-monitoring of database instances. The system collects performance metrics, wait statistics, disk utilization, index usage, and query performance data through Extended Events, DMVs, and performance counters, storing the data in a structured SQL Server schema. It features a dual-component architecture: a monitoring agent deployed on each target SQL Server instance (using SQL Agent jobs or Service Broker for scheduling) and an optional central repository importer (SqlWatchImport) for aggregating data from multiple instances. The solution includes alerting via threshold-based checks, automated actions, and integrates with Power BI and Grafana for visualization. Although the code demonstrates solid engineering patterns like snapshot-based collection, delta calculations, and metadata-driven configuration, the README explicitly states the open-source version is no longer actively developed, with active development moved to sqlwatch.cloud.