region - the name of the region where the instance is located.
availability_zone - the name of the Availability Zone the instance is located in.
endpoint - the DNS address of the instance.
ipv4 - the IP address of the instance.
port - the TCP port that the instance is listening on.
engine - the database engine.
engine_version - the database engine version.
instance_type - the instance
type (compute and memory class name, e.g.,
db.m5.large)
secondary_availability_zone - the name of the secondary Availability zone for
Multi-AZ deployments
cluster_id - if the instance is a part of an Aurora Cluster, this label contains the id of the cluster.
source_instance_id - if the instance is a
Read Replica, this label contains the
id of the primary instance.