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kubernetes-reflector
Custom Kubernetes controller that can be used to replicate secrets, configmaps and certificates.
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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.
You should have you app deployed from a git repo using something like ArgoCD, Flux, or fleet. You would then make your changes in git to have the synced to your target clusters. I've never used it, but you could also look at https://github.com/emberstack/kubernetes-reflector
NOTE:
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Hence, a higher number means a more popular project.