ansible: quiesce boto logger; closes #541.

ansible_mitogen/logging.py

@@ -54,7 +54,8 @@ class Handler(logging.Handler):
     #: may simply be to bury all target logs in DEBUG output, but not by
     #: overriding their log level as done here.
     NOISY_LOGGERS = frozenset([
-        'dnf',  # issue #272; warns when a package is already installed.
+        'dnf',   # issue #272; warns when a package is already installed.
+        'boto',  # issue #541; normal boto retry logic can cause ERROR logs.
     ])
 
     def emit(self, record):

docs/changelog.rst

@@ -150,6 +150,11 @@ Fixes
 * `#540 <https://github.com/dw/mitogen/issues/540>`_: the ``stderr`` stream of
   async module invocations was previously discarded.
 
+* `#541 <https://github.com/dw/mitogen/issues/541>`_: Python error logs
+  originating from the ``boto`` package are quiesced, and appear only in
+  ``-vvv`` output. This is since many EC2 modules triggers errors during normal
+  operation, in the process of retrying transiently failing requests.
+
 * `748f5f67 <https://github.com/dw/mitogen/commit/748f5f67>`_: the
   ``ansible_ssh_host`` variable is respected when ``mitogen_via=`` is active.