Example:
tarantool> picolib.whoami()
---
- raft_id: 1
cluster_id: demo
instance_id: i1
...
tarantool> picolib.peer_info("i1")
---
- raft_id: 1
instance_id: i1
instance_uuid: 68d4a766-4144-3248-aeb4-e212356716e4
replicaset_uuid: e0df68c5-e7f9-395f-86b3-30ad9e1b7b07
replicaset_id: r1
advertise_address: localhost:3301
target_grade: Online
current_grade: Online
...