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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.
There's evil-commentary, which is IMO easier to setup. Just install it and enable (evil-commentary-mode) on startup.
There's also evil-nerd-commenter, which also provides text objects so that you can do eg. yic to copy your comments. This one also works without Evil. g c isn't bound by default though (the default key is , ,).
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