Add/update instrumentation for @koa/router #1343
Description
Is your feature request related to a problem? Please describe.
The koa-router module seems to have become unmaintained as of late, resulting in a fork being made and placed under the "official" @koa namespace. See this ticket for details.
Due to how this module shims middleware, moving to @koa/router would cause breakage.
Describe the solution you'd like
Please consider including @koa/router in the instrumentation MODULES set.
Given how modules are required in the loader, there is sadly no straightforward way to link multiple entries to the same source file; symlinking might be dangerous, not sure how that'd work out cross-platform?
Describe alternatives you've considered
Made a quick attempt at using agent.addPatch(...) as suggested in #878. Had to tweak the validation logic in lib/instrumentation/modules/koa-router.js as well, as the (!semver.satisfies(version, '>=5.2.0 <8')) rejects @koa/router, which is at major version 8.
Would not consider this a permanent solution, regardless.
Edit: More details about the workaround, fixed typo.