Goal:

In order to make informed decissions about changes in architecture in Watcher we need to have measures for metrics related to the decision-engine performance, specially:

• Size of the ClusterModel
• Time taken since the ongoing audit is created until execution starts
• Execution time of audits

Acceptance Criteria:

• Metrics should be available via notifications. 
• I should be possible to enable/disable the performance metrics.

Open questions:

• Does osprofiler provides what we need or need to create some ad-hoc implementation?