Being able to pin a set of requests to a specific path inside the infrastructure to they touch only specific instances running specific versions without adding

Being able to pin a set of requests to a specific path inside the infrastructure to they touch only specific instances running specific versions without adding "if blah-blah-blah" custom code into every deploy Being able to trace every request across the entire infrastructure including all sub-requests the original request triggered. Being able to observe issues pinned requests caused, automatically trigger an action when an error rate exceeds the threshold, typically removing the pinning.