[hagen1778]

VictoriaMetrics co-founder here.

There are many similar features between Mimir and VictoriaMetrics: multi-tenancy, horizontal and vertical scalability, high availability. Features like Graphite and Influx protocols ingestion, Graphite query engine are already supported by VictoriaMetrics. I didn't find references to downsampling in Mimir's docs, but I believe it supports it too.

There are architectural differences. For example, Mimir stores last 2h of data in local filesystem (and mmaps it, I assume) and once in 2h uploads it to the object storage (long-term storage). VictoriaMetrics doesn't support object storage and prefers to use local filesystem for the sake of query speed performance. Both VictoriaMetrics and Mimir can be used as a single binary (Monolithic mode in Mimir's docs) and in cluster mode (Microservices mode in Mimir's docs). The set of cluster components (microservices) is different, though.

It is hard to say something about ingestion and query performance or resource usage so far. While benchmarks from the project owners can be 100% objective, I hope community will perform unbiased tests soon.