Workflow usage statistics

Show Graphs with the usage of the particular workflow over a time span.

The library Charts.js can be used for the graphs.

Depends on clowm-workflow-service#24 (closed)

changed milestone to %Version 2.0.0

added Workflow WorkflowExecution labels

assigned to @daniel.goebel

marked this issue as related to clowm-workflow-service#24 (closed)

created branch feature/48-workflow-usage-statistics to address this issue

mentioned in merge request !48 (merged)

mentioned in commit 57e93bb7

mentioned in commit 1bb9d5b7

closed with merge request !48 (merged)