In Iebcde4645d472d2 I broke the way we generate metrics keys from
endpoint paths. Instead of using the declared paths with placeholders,
we were recording the actual paths, resulting in an explosion of metrics
keys.
This moves metrics logging from Router into Module, where the declared
path is available. This patch also introduces regression tests for the
issue.
Bug: T365111
Change-Id: I2c9ddfe6e28aaecd313356894f17033e2db59073
Modules group together endpoints by a shared prefix. The idea is that each module has its own version and can generated self-contained self-documentation. This allows clients to have clear expectations about the endpoints of each module, no matter what wiki they are accessing. So far, each wiki may be exposing a different set of endpoints, with no way to provide a spec that describes that set of endpoints in a way that would be consistent across wikis and stable over time.
Bug: T362480
Change-Id: Iebcde4645d472d27eee5a30adb6eee12cc7d046b
