can i use histogram dump to monitor read/write at namespace level and can i know how histogramdump is being updated how it actually works

Hi @random, check out the docs for information about histogram dump. In short, read and write histograms are tracked on a per namespace basis and the {ns}-read and {ns}-write histograms are enabled by default. Reads track from the time the request hits the node until the response leaves the node and writes are tracked from end-to-end, including replication.

The frequency with which histograms are written to the log is configured by the ticker-interval configuration parameter. Again for a more in-depth look, have a look at the docs

You may also get histograms for the most recent slice with the latencies info command.

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