Add todo item

TODO.md

@@ -56,6 +56,10 @@ CREATE TABLE app.customer_metadata (...);
       leaves around `master-bin`, `logger-bin`, and `diachron:nnnn` processes.
       Huge problem.
 
+- [ ] Fix format used by master (and logger?)'s output: it should be logfmt
+  - A lot of other stuff should probably be logfmt too but maybe we can get to
+    that later
+
 ## medium importance
 
 - [ ] Add a log viewer