log only configured xfcc header (#648)

[codex] log XFCC auth failure headers (#647)

* log xfcc auth failure headers

* cover xfcc auth logging tests

[codex] Add latency phase metrics (#634)

* Add latency phase metrics

* Rename upstream latency metric

* Fix upstream timing boundary

* Align request metrics with latency counts

* Clarify unknown request metrics

Release v0.2.11

Release v0.2.10

Release v0.2.9

Release v0.2.8

Release v0.2.7

Release v0.2.6

Release v0.2.5