Transaction tracking and tracing are not the same thing. One of the top 10 banks in the world recently chose Nastel and this was their primary reason. They had a Priority 1 request processor incident on the mainframe where high value messages went missing and it took two weeks to find them. They began by looking at another vendor who said that they did transaction tracking. As the customer said, "They will try to tell you that they do transaction tracking, and that took us a while to drill down." So, let me explain the difference between these terms using an analogy.
OpenTelemetry is a Cloud Native Computing Foundation(CNCF) project aimed at standardizing the way we instrument applications for generating telemetry data(logs, metrics, and traces). However, OpenTelemetry does not provide storage and visualization for the collected telemetry data. An APM that can ingest telemetry data collected by OpenTelemetry can help you set up a robust observability stack.