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+..
+  Copyright 2020 Canonical Ltd.
+
+  This work is licensed under a Creative Commons Attribution 3.0
+  Unported License.
+  http://creativecommons.org/licenses/by/3.0/legalcode
+
+..
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+  any of the sections in this template.  If you have nothing to say
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+
+============================================
+Enablement of S3 storage backend for Gnocchi
+============================================
+
+Problem Description
+===================
+
+The gnocchi charm is a multi-tenant times eries, metrics and resources
+database. It currently only supports connections to a Ceph storage
+backend. For anyone using a S3 storage backend, this is an issue.
+
+Proposed Change
+===============
+
+The proposed solution is to make the choice of storage backend a
+configuration option. The relation between gnocchi and ceph-mon would become
+an optional one, that would be activated only when Ceph is the selected backend.
+The upstream documentation of Gnocchi mentions that S3 storage backends are
+supported, along with others, such as Swift, Redis and Ceph
+(https://gnocchi.xyz/install.html). The new feature would be supported on OpenStack
+Stein (and later) on Ubuntu 18.04 LTS.
+
+
+Alternatives
+------------
+
+None.
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee: camille.rodriguez
+
+Gerrit Topic
+------------
+
+Use Gerrit topic "s3-storage" for all patches related to this spec.
+
+.. code-block:: bash
+
+    git-review -t s3-storage
+
+Work Items
+----------
+
+* Add a charm option for selecting S3
+
+* Add options for S3 in the configuration file:
+
+  * S3 endpoint URL
+  * S3 region name
+  * S3 access key id
+  * S3 secret access key
+  * Prefix to namespace metric bucket: s3_bucket_prefix = gnocchi
+  * Maximum time to wait checking data consistency when writing to S3: s3_check_consistency_timeout = 60
+  * The maximum number of connections to keep in a connection pool: s3_max_pool_connections = 50
+
+* Make the Ceph relation and configuration optional, dependent on the charm option
+
+* Implement https endpoint for S3
+
+Timeline
+-----------
+
+The goal is to implement this change in the OpenstStack Charms 20.08 release. The freeze date for
+this release is July 24th 2020, for a release on August 5th (see release
+schedule). This change should be proposed for merging at least two weeks
+ahead of freeze, so ideally submitted by July 10th 2020.
+
+Repositories
+------------
+
+Changes will be pushed to the existing gnocchi charm repository:
+
+https://git.openstack.org/openstack/charm-gnocchi
+
+
+Documentation
+-------------
+
+* Update of the charm options
+
+* Update of the charm README
+
+
+Security
+--------
+
+No additional security concerns. The feature will be compatible
+with an HTTPS endpoint to allow for encryption.
+
+Testing
+-------
+
+Code changes will be covered by unit tests.
+Functional tests would require S3 storage hardware or software emulation.
+This is possible through a Swift deployment, or with RADOS Gateway. The deployment
+of the storage backend with S3 capability would be independent from the
+OpenStack bundle, to represent a real scenario.
+
+
+Dependencies
+============
+
+No dependencies outside of this specification.