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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.
Indeed, release 1.21 will include Traefik 2. See: https://github.com/k3s-io/k3s/issues/1141
Updating k3s is much easier using their system upgrade controller. I've been using it for a year and no hiccups. Runs in cluster, updates automatically depending on what release channel you want to use.
NOTE:
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Hence, a higher number means a more popular project.