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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.
If you also want to use cert-manager, it's easiest for you to follow their instructions, as explaining it all here would be out of scope for this blog post, since you may not even care about using HTTPS at all. In brief, my cert-manager deployment authenticates with cloudflare using an API key with limited permissions using a DNS-01 challenge. You can read more about DNS-01 challenges here. You can also see my cert-manager deployment here.
I did this for each node, you could use a terminal multiplexer (like tmux) to speed things up a bit.