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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 are planning on using Kubernetes strictly for learning purposes then I recommend using Kubernetes in Docker: https://kind.sigs.k8s.io It's super easy to use and installable from the most popular package managers. Managed Kubernetes (EKS, GKE and AKS for example) present some conveniences to integrate with other cloud-native services such as databases. You can also attach identity elements to your pods for example in EKS you can attach specific roles to service accounts using annotations to facilitate communication from your deployments to other AWS services.