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We've tried several and landed on CheckMK. https://checkmk.com. Easy to use out of the box, lots of different types of monitors/probes/endpoints, and custom endpoints can be programmed for our weird things.
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Have a look at LibreNMS. Does more than sending alerts for low disk space and it's free. They have really good documentation on how to set it up. You can also download a preinstalled VM.
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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.
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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.