Google Data Studio Visualize Count of Distinct Events in Pie Chart - visualization

Question

We have a list of tasks on the website that all users need to perform before they are able to apply for a job. Tracked by Events
I'm able to create a table by userid that shows all the task that were completed by that user and then I'm able to create a table that shows distinct count of all tasks they've finished.
To count the task events, I've created a new metric
COUNT_DISTINCT(Event Action)
Then using a filter to show the task I'm interested in.
Tasks completed by User:
User ID
Count of Tasks Completed
1
11
2
11
3
11
4
10
5
9
6
9
7
4
8
4
9
4
10
2
What I'd like to do is show a pie chart that display the % of users that completed a certain number of tasks. For example 30% completed 10 tasks, 20% completed 9 tasks, etc.

Answer 1

Took a while, but I finally figured this one out.
First you have to create three new metrics, one to count distinct events and one to count distinct user IDs You need a third to convert the distinct event counts into a usable metric for calculating a completion % and is based on the distinct event counts.
Then I created filters to isolate the specific events I'm interested in.
Since you can't re-aggregate data or apply filters based on a custom metrics in a data source, I created two separate tables with the necessary filters in order to blend the data.
I then blended the data and created the necessary additional filter based on the event count and applied to desired blended source. In this case, I want to see all users with an ID that finished 11 tasks.
Blended table
Blended data source
The final step is divide the total number of desired events / total users to get a completion rate.
And here's the custom metric for that.
This is pretty controverted and took taking several technics from several blog sources and combining them into one work flow.