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planor
The Cloud Aviator: TUI client for cloud services (AWS, Vultr, Heroku, Render.com, Fleek, ...)
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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 can offer you Planor for general instance monitoring as well as CloudWatch logs, however it does not have an explicit log for when the machine might have been unreachable. What you're looking for sounds more like Grafana/Telegraf.
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