**Related dev. issue(s):** https://github.com/tarantool/tarantool/issues/9842 **Parent doc. issue(s):** https://github.com/tarantool/doc/issues/4129 **Product:** Tarantool **Since:** 3.1 **Root document:** not created yet (https://github.com/tarantool/doc/issues/4129) **SME:** @ ImeevMA # Details Three new options were introduced in `connpool.filter()` and `connpool.call()` functions: `instances`, `replicasets` and `groups`. 1) The `instances` option is a list of instance names to which the filtered instances should belong. 2) The `replicasets` option is a list of replicaset names to which the filtered instances should belong. 2) The `groups` option is a list of group names to which the filtered instances should belong. Requested by @ImeevMA in https://github.com/tarantool/tarantool/commit/a8164c7793e105e8f924321f61ffa10434e1100d.