A Grafana k6 extension that lets you load-test IBM mainframe applications over the TN3270/TN3270E protocol. Runs concurrent virtual users with per-VU subprocess isolation via s3270, supports all standard 3270 operations (PF/PA keys, Enter, Tab, Clear), and captures screen contents for assertion and debugging. Builds on z/OS with specific USS environment configuration. Companion to k6port, a native z/OS port of the k6 binary.