Comment 3 for bug 1871813

Reviewed: https://review.opendev.org/731761
Committed: https://git.openstack.org/cgit/openstack/oslo.messaging/commit/?id=39f770f55b3331b7a99b3ea42a34982a20635cf2
Submitter: Zuul
Branch: stable/ussuri

commit 39f770f55b3331b7a99b3ea42a34982a20635cf2
Author: shenjiatong <email address hidden>
Date: Thu Apr 9 18:00:39 2020 +0800

    Print warning message when connection running out

    I believe when connection pool running out of available
    resources, there will be all kinds of weird consequences
    following. So let's print warning logs when we are going
    to waiting indefinitely for the lock

    Change-Id: I5ca930cada523bc77c644703a0f02b9160816231
    Related-bug: #1871813
    (cherry picked from commit 96300a32213d1a9bf114b90bef6971d69b839d1d)