Maybe I don't understand the problem, but can you not just store it in memory (e.g., with a map from key to current value), update (for instance, increment) it as you go, and whenever you want to take a timeseries value just push the set of current values back to a vector?
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What kind of telemetry exactly?
Maybe I don't understand the problem, but can you not just store it in memory (e.g., with a map from key to current value), update (for instance, increment) it as you go, and whenever you want to take a timeseries value just push the set of current values back to a vector?
Likely needs to survive a crash (can't lose 100MB chunks)