fix gendoc

gendoc throws: `AttributeError: 'Sphinx' object has no attribute 'info'`

use logging provided by sphinx.util (not sure why it's using sphinx logger
but meh)

don't fail everything if one group missing metric

Old aggregate API was allowing rate:XXX format for rateofchange
aggregation.

This change restores it since we use the new internal API.

Closes: #1016

it's possible that not all groups will contain a specific metric.
rather than fail, return the groups that do have the matching metric.
only if all groups don't have matching metrics, should we fail.

Fixes: #1013

catch and carry on.

Closes: #996

the REST output seems to be clashing with the formatting of previous
element. remove the formatting and move the REST output above.

The error detail looks like:

  {
    'cause': 'Invalid input',
    'reason': 'boulet',
    'detail': ['field'],
  }

Note:

Voluptuous prints `r` before data path for
str(voluptuous.Invalid) in Python2. To simplify
tests in Python2 and Python3, the error reasons
are checked by regex.

This extension does not work anymore and is not maintained upstream.

Fixes #953

The description of the project is currently not rendered on
Pypi.  Instead, Pypi shows raw rst.  Checking the page with
"readme_renderer" reports "undefined substitutions" for "time
series" and "aggregates".

This patch adds a before_deploy section to .travis.yml that
uses sed to remove matching pairs of pipes from the README.

The resulting README was tested again with the readme renderer.

See Also:
    https://pypi.org/project/readme_renderer/

Closes #980

The high archive policy created by default contains three different
granularity definitions - 1 second, 1 hour and one day. For such
metrics the split computation has been done incorrectly as it was
using oldest keys not taking into account those keys granularity.
It caused TypeErrors when comparing two SplitKeys with different
granularities.

closes: gnocchixyz/gnocchi#959

Change-Id: I9747a9bc9f9adea61bb6bcca571aa90c473172d5

Fixes #966

This is needed by reno.
docs-gnocchi.xyz job does not work see #953

This reverts commit 88bfa6fe which was merged
into master by mistake.

Currently we have some case where `python setup.py --version` add
`+nnone` to the local version. Since we don't care of the local part
just throw it.

This enables gnocchi-amqp daemon.

Which listens to metrics from collectd amqp1 write plugin.

This is specific to the REST API.

This is very specific to the API

This from the old Zuul gate.

Regex must start be ^ now.

The iteration over the results was wrongly computed and did not return data for
the second metric and following.

incoming data isn't that large but if we don't need to build a list
why build it.