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monito
Discontinued Monito provides a configuration based light weight remote server status page with liveness monitoring and notifications.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Cachet: https://cachethq.io
I recently made Monito https://github.com/tejzpr/monito. It is a simple, configurable monitor that provides a status page and provides Prometheus compatible metrics that can be consumed by Grafana.
Uptime kuma or grafana dashboard would be my 2 cents https://github.com/louislam/uptime-kuma
NOTE:
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Hence, a higher number means a more popular project.