The Vault server process collects various runtime metrics about the performance of different libraries and subsystems. These metrics are aggregated on a ten-second interval and are retained for one minute. This telemetry information can be used for debugging or otherwise getting a better view of what Vault is doing.

Telemetry information can be streamed directly from Vault to a range of metrics aggregation solutions as described in the telemetry Stanza documentation.

Reference link:- https://www.vaultproject.io/docs/internals/telemetry