Install:

  go get github.com/tscolari/lag

Usage:

  lag logfile.log

Q exits
arrow up/down moves cursor up/down
k/j moves cursor up/down (vim)
page up/down moves page up/down
enter zooms into the selected entry
l zooms into the selected entry (vim)
q zooms out from the selected entry
h zooms out from the selected entry (vim)
backspace zooms out from the selected entry
e filters for errored logs only (q to zoom out)
D filters out similar log entries (those that the message matches exactly the one under the cursor)
i toggle current selected entry's session information popup