Kong Correlation-id plugin and out of box unique Request ID

Here is crisp summary of differences between them

	Correlation ID plugin	Out of Box Request ID
Plugin	Yes its a plugin	Not a plugin, but comes by default as debugging tool
Kong Version Available in	Before 3.5.0.0	Started with 3.5.0.0
Adds Header	Adds new header for every request	Yes adds header for every request
Header Name can be customised	Yes, in the plugin name can be altered	No the header name can't be changed
Control what the value of the header	Yes, different generators can be configured	No, can not control the value
Control Header being sent downstream and upstream	Always added to downstream by default. Can control if sent upstream using echo_downstream configuration parameter	Configurable for upstream using the headers configuration options. Configurable for downstream using headers_upstream configuration options
Nginx logs	Not visible by default in access log, need to edit the nginx_kong.lua file and update the log formatter	Populated by default in the error log, access log, error templates, log serializer, and in a new X-Kong-Request-Id header