When discussing T214, I realized I may need to add a new logging category to track the timestamps for racing blocks. schancel suggested the following:

schancel [1:40 PM]
@jasonbcox If you are going to do that I would actually like to do something a little more subtle.
@jasonbcox That'd be to keep the category which maps to a syslog level as well. But to introduce structured log which allows adding key-values to the entries.
Doing this would allow us to pretty easily do all kinds of log analysis.

EDIT: Created new tickets for these tasks, as they're kinda orthogonal to implementing header timestamp tracking (although they do make it nicer!):
Adding syslog levels: https://reviews.bitcoinabc.org/T221
Adding key-value support: https://reviews.bitcoinabc.org/T222