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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 have not used it, but it does look like you can send to Gotify from the command line with the gotify-cli or httpie. You could probably modify the unattended-upgrades scripts to incorporate its usage and achieve it that way. You would then get an email and a Gotify alert.
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