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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.
I work in a very diverse shop, and we use Checkmk
Or Uptime Kuma. Installed via Docker, but you might be familiar with Docker yet since you are a new admin. https://github.com/louislam/uptime-kuma Uptime monitoring/dashboard.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.