Comment 16 for bug 1787214

Reviewed: https://review.openstack.org/598338
Committed: https://git.openstack.org/cgit/openstack/oslo.log/commit/?id=871d2df290d829b9cafb0dc383dc3d65810c2dac
Submitter: Zuul
Branch: stable/rocky

commit 871d2df290d829b9cafb0dc383dc3d65810c2dac
Author: Ben Nemec <email address hidden>
Date: Mon Aug 27 17:44:40 2018 +0000

    Filter args dict in JSONFormatter

    In most formatters, any unused keys in the args dict will just be
    discarded. Because JSONFormatter logged the entire dict in addition
    to the message, some values were included in the output that may
    not have been intended. This could include sensitive data, so we
    should stop that.

    In the interest of maintaining compatibility with any tools that are
    reading the args dict, we leave the dict but filter out any unused
    keys.

    Change-Id: Ib64837c1ae93a27bef3d30a776320a373f18dd1c
    Closes-Bug: 1571714
    Closes-Bug: 1787214
    (cherry picked from commit a93c6ef98c8aeddc5a4ae87083689225fbc728bb)