NAME
    log-defer-viz - command-line utility for rendering log messages created
    by Log::Defer

DESCRIPTION
    Log::Defer is a module that creates structured logs. Read its
    documentation which explains how structured logging can help you.

    This module installs a command-line script that parses these logs and
    displays them in a readable manner.

INPUT METHODS
        $ cat file.log | log-defer-viz
        $ log-defer-viz < file.log
        $ log-defer-viz file.log
        $ log-defer-viz file.log file2.log
        $ log-defer-viz archived.log.gz more_logs.bz2

INPUT FORMAT
        $ log-defer-viz --input-format=json  ## default is newline separated JSON
        $ log-defer-viz --input-format=sereal  ## Sereal::Decoder (not impl)
        $ log-defer-viz --input-format=messagepack  ## Data::MessagePack (not impl)
        $ log-defer-viz --input-format=storable  ## Storable (not impl)

    Note: The only input format currently implemented is newline-separated
    JSON.

LOG MESSAGES
        $ log-defer-viz  ## by default shows error, warn, and info logs
        $ log-defer-viz -v  ## verbose mode (adds debug logs and more)
        $ log-defer-viz --debug  ## show debug logs
        $ log-defer-viz --quiet  ## only errors and warnings
        $ log-defer-viz --verbosity 25  ## numeric verbosity threshold
        $ log-defer-viz --nowarn  ## muffle warn logs (so show error and info)
        $ log-defer-viz --nologs  ## don't show log section
        $ log-defer-viz --nocolour  ## turn off terminal colours

TIMERS
        $ log-defer-viz --timer-columns 80  ## width of timer chart
        $ log-defer-viz --since-now  ## show relative to now times
                                     ##   like "34 minutes ago"
        $ log-defer-viz --notimers  ## don't show timer chart

DATA SECTION
    Data is extra embedded information in the log file. The available
    outputs are "pretty-json", "json", "yaml", and "dumper".

        $ log-defer-viz --data  ## show data section. default is pretty-json
        $ log-defer-viz --data-format=json  ## compact, not pretty
        $ log-defer-viz --data-format=dumper  ## Data::Dumper
        $ log-defer-viz --data-only  ## only show data

MISC
        $ log-defer-viz --help  ## the text you're reading now
        $ log-defer-viz --grep '$_->{data}'  ## grep for records that have a data section.
                                             ## $_ is the entire Log::Defer entry.

GREPING
    As shown above, there is a "--grep" command-line option. This lets you
    filter log messages using arbitrary perl code. If the expression returns
    true, the log message is processed and displayed as normal.

    Being able to do this easily is an important advantage of structured
    logs. With unstructured logs it is often difficult to extract all of the
    information related to a request and nothing else.

    For example, here is how to grep for all requests that took longer than
    500 milliseconds:

        $ log-defer-viz --grep '$_->{end} > .5' server.log

    Depending on your underlying storage format, it may be meaningful to
    grep before passing to "log-defer-viz". Currently the only supported
    storage format is newline-separated JSON which *is* designed to be
    pre-grepable. If your search string appears anywhere in the object, the
    entire log message will be displayed:

        $ grep 10.9.1.2 app.log | log-defer-view

    The final and most error-prone way to grep Log::Defer logs is to grep
    the unstructured output of "log-defer-viz":

        $ log-defer-view app.log | grep 10.9.1.2

SEE ALSO
    Log::Defer

    <Log::Defer::Viz github repo>

AUTHOR
    Doug Hoyte, "<doug@hcsw.org>"

COPYRIGHT & LICENSE
    Copyright 2013 Doug Hoyte.

    This module is licensed under the same terms as perl itself.