It was an area that was absolutely necessary at the operational level, and it was incredibly helpful to show the area to be reached!! Unlike commercial APMs that are relatively very expensive, it was good to see that it can be solved with technology by combining open source APM tooling, and especially because it was a lecture that explained in Korean the combination of open sources that are currently growing in the community, it was better than expected. In particular, even if you don't use the tool directly, the explanation of how the concepts used in o11y are solved in each implementation system and UI and why filtering work must be involved was impressive. Thank you.