danger-gitlab_graph is a Danger ruby plugin that allows you to extract and display metrics gathered from the current and previous pipeline runs. This plugin is only works with GitLab CI at the moment.

It works similar to the existing test coverage extraction provided by GitLab natively: You provide a job name, an extraction regex (including a single capturing group) and some other, optional configuration options. The plugin then creates an svg graph (using the svg-graph2 gem) and adds them to your other Danger comments.

$ gem install danger-gitlab_graph

Methods and attributes from this plugin are available in
your `Dangerfile` under the `gitlab_graph` namespace.

gather_metric - Gathers metric data from current and pevious pipelines

Sample code:

@my_plugin.gather_metric({
                           regex: /took ([0-9]+)/,
                           series_name: "Performance",
                           job_name: "test1"
                         })

returns an array similiar to this:

[{ hash: "b23f54ecdc3add9abea9344f66b49f1699bff547", metric: 16.0, pipeline_id: 1119 },
 { hash: "3333333333333333333333333333333333333333", metric: 6.0, pipeline_id: 123_456 }]

report_metric - Creates and comments a graph based on a certain metric, extracted via regex

Sample code

gitlab_graph.report_metric([{
                              regex: /took ([0-9]+)/,
                              series_name: "Performance",
                              job_name: "test1"
                            }, {
                              regex: /slept ([0-9]+)/,
                              series_name: "IDLE time",
                              job_name: "test1"
                            }]) < /pre>

outputs a graph similiar to this

and writes it directly into the danger comment:

1. Clone this repo
2. Run bundle install to setup dependencies.
3. Run bundle exec rake spec to run the tests.
4. Use bundle exec guard to automatically have tests run as you make changes.
5. Make your changes.