Add special 500/502/504 classes, with 500 split into 'nginx' (i.e., without stacktrace) and 'trace' pieces. Leaves 5xx as a catchall class.
Don't throw out data when size = 1024
Merge branch 'detailed-nginx-status'

* detailed-nginx-status:
  Don't throw out data when size = 1024
  Add special 500/502/504 classes, with 500 split into 'nginx' (i.e., without stacktrace) and 'trace' pieces. Leaves 5xx as a catchall class.