Cloudkitty monasca fetcher implementation

https://storyboard.openstack.org/#!/story/2006675

Monasca is already supported in cloudkitty through its collector. However, cloudkitty lacks a dedicated fetcher for monasca, relying instead on other fetchers.

Problem Description

No scope discovery is available when using the monasca collector. This forces users to use the keystone fetcher and assign the ‘rating’ role to every project where cloudkitty is needed. Another less than ideal solution is to use the ‘source’ fetcher, but that requires to specify every scope in the configuration file.

Proposed Change

Implementing a new fetcher using monasca to discover scopes:

• The fetcher will connect to monasca and retrieve a list of scopes (dimensions values in monasca) given a specified dimension name. This is achieved through monasca’s python client and its metrics.list_dimension_values() method.

• The monasca endpoint will be retrieved from keystone in similar fashion to the monasca collector, as it is needed for the monasca client initialization. This is a good opportunity to mutualize the monasca’s client bootstraping code in a common file.

Configuration options include:

• dimension_name: the monasca dimension from which the scope_ids should be retrieved, defaults to project_id.

• monasca_tenant_id: The monasca tenant id, has no default value.

• monasca_service_name: Name of the monasca service, defaults to monasca

• interface: Endpoint type, defaults to internal

Alternatives

None

Data model impact

None

REST API impact

None

Security impact

The fetcher will use the same authentication mechanism as the current monasca collector (keystone for authentication and python-monascaclient for monasca interactions), and won’t introduce any new dependency. Thus, the new fetcher shouldn’t have any security impact.

Notifications Impact

None

Other end user impact

None

Performance Impact

None

Other deployer impact

None

Developer impact

None

Implementation

Assignee(s)

Primary assignee:

qanglade/qanglade

Other contributors:

lukapeschke/peschk_l

Work Items

• Implement a cloudkitty monasca scope fetcher using python-monascaclient.

Dependencies

No new dependency is needed.

Testing

Regular unit tests will be included.

Documentation Impact

Documentation of the new fetcher will be added, mostly covering configuration of the fetcher.

References

None.