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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 used a g-suits account for alerting from Freenas and simplemonitor. For no reason, every so often I would notice no alerts for things would would be sent. I got frustrated and found Amazon SNS as a suitable replacement. It can send to email and/or sms, the free tier is enough as I try hope to keep alerts low.
NOTE:
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Hence, a higher number means a more popular project.