As mentioned on Gitter:
@NicolasT: Suggestion for jaeger-ui: there's this red marker which appears when hovering over the timeline. Maybe it'd be nice to show the same line above the appropriate time when hovering over a log entry in one of the span details, to get some visual indication of when the log entry was emitted, next to the timestamp displayed on top of it
@yurishkuro: please book a ticket. We actually had something like that before in the early versions
@yurishkuro: another option is to put permanent markers on the span bar that would correspond to the time when log events happened