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This code is extracted from pg_stat_get_backend_io() in pgstatfuncs.c, so as it can be shared with other areas that need backend pgstats entries while having the benefits of the various sanity checks refactored here. As per its name, this retrieves backend statistics based on a PID, with the option of retrieving a BackendType if given in input. Currently, this is used for the backend-level IO statistics. The next move would be to reuse that for the backend-level WAL statistics. Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com> Discussion: https://postgr.es/m/Z3zqc4o09dM/Ezyz@ip-10-97-1-34.eu-west-3.compute.internal