eventstore_tcp_received_bytes metric shows incorrect data. about eventstore_exporter HOT 4 CLOSED

Hi Andrii,

This metric's value is extracted from /stats endpoint, tcp.receivedBytesTotal key. Can you explain why you suspect this value is wrong?

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Hi Marcin,

We ran performance tests for EventStore. And noticed that the metric value (was about 38-40 Mb / sec) was in a few times higher than the data volume we were sending to the EventStore (about 4-5 Mb / sec).

So we checked the output network value (about 4-5 Mb / sec) from the load generator environment and calculated the maximum possible size based on the maximum event size and events count per second ( 7 Mb/sec ).
Also EventStore Disk I/O shows (7-8 Mb/sec for write).

We got the correct value (4-5 Mb/sec) of the metric when we divided by 8. (rate(eventstore_tcp_received_bytes{env="test", group="es-poc", stack="eventstore-exporter"}[5m])/8)

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I've checked values reported by ESDB dashboard vs values in exporter and they are pretty much the same.

Is it possible you have another ESDB connection you are not aware of? Especially in cluster scenarios, the received bytes at the server will not be the same as sent bytes from your load generator. All connections should be listed in the ESDB dashboard, so please take a look.

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Closing due to no activity

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