Various long-running processes such as index building and map/reduce jobs log progress updates like this:

63600/153051 41%

If there are no other log messages during the long-running process the resulting log file looks great and is easy to interpret. However, on an active server those messages will be interleaved with various other log messages, making it difficult to figure out what process is being described.

It would be useful to get more context for each of the progress log lines so they stand on their own.