Treat multi-line log messages as single block and allow variables to work across the whole block

Idea created by trevor.morgan on Apr 2, 2015

    Logmon probe allows processing of multi-line messages by using a format.
    However, watchers are only able to work on the first line of that block found, and so it's not possible to use a pattern to match on or extract variables from other lines.

    This would be a very useful addition to the probe.