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mimir
Grafana Mimir provides horizontally scalable, highly available, multi-tenant, long-term storage for Prometheus.
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cortex
A horizontally scalable, highly available, multi-tenant, long term Prometheus. (by cortexproject)
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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 can use the Remote write feature to send to a centralized location. It would have to be scalable like Cortex https://cortexmetrics.io/
Using that, and not only for prometheus - the best! https://victoriametrics.com/
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.