Bug trends sample report

Azure DevOps Services | Azure DevOps Server 2019

This article shows you how to display, for a given set of open Bugs, the number of Bugs in each State, trended over a period of time. The following image shows an example of such a trend.

Sample - Boards Rollup - Report

Note

This article assumes you've read Overview of Sample Reports using OData Queries and have a basic understanding of Power BI.

Sample queries

You can paste the Power BI query listed below directly into the Get Data->Blank Query window. For more information, review Overview of sample reports using OData queries.

let
   Source = OData.Feed ("https://analytics.dev.azure.com/{organization}/{project}/_odata/v3.0-preview/WorkItemSnapshot? "
        &"$apply=filter( "
            &"WorkItemType eq 'Bug' "
            &"and State ne 'Closed' "
            &"and startswith(Area/AreaPath,'{areapath}') "
            &"and DateValue ge {startdate}  "
            &") "
        &"/groupby( "
            &"(DateValue,State,WorkItemType,Priority,Severity,Area/AreaPath,Iteration/IterationPath,AreaSK), "
            &"aggregate($count as Count) "
            &") "
    ,null, [Implementation="2.0",OmitValues = ODataOmitValues.Nulls,ODataVersion = 4]) 
in
    Source

Substitution strings

Each query contains the following strings that you must substitute with your values. Do not include brackets {} with your substitution. For example if your organization name is "Fabrikam", replace {organization} with Fabrikam, not {Fabrikam}.

  • {organization} - Your organization name
  • {project} - Your team project name, or omit "/{project}" entirely, for a cross-project query
  • {areapath} - Your Area Path. Example format: Project\Level1\Level2
  • {startdate} - The date to start your trend report. Format: YYYY-MM-DDZ. Example: 2019-04-01Z represents 2019-April-01. Do not enclose in quotes.

Query breakdown

The following table describes each part of the query.

Query partDescription
$apply=filter(Start of filter statement
WorkItemType eq 'Bug'Return Bugs.
and State ne 'Closed'Omit Closed bugs.
and startswith(Area/AreaPath,'{areapath}')Work items under a specific Area Path. Replacing with Area/AreaPath eq '{areapath}' returns items at a specific Area Path.
To filter by Team Name, use the filter statement Teams/any(x:x/TeamName eq '{teamname})'.
and DateValue ge {startdate}Start trend on or after the specified date. Example: 2019-04-01Z represents 2019-April-01.
)Close filter()
/groupby(Start groupby()
(DateValue, State, WorkItemType, Priority, Severity, Area/AreaPath, Iteration/IterationPath), Group by DateValue (used for trending), and any fields you want to report on.
aggregate($count as Count)Aggregate by counting bugs that match the criteria on each date
)Close groupby().

Power BI transforms

Expand Area, Iteration, AssignedTo columns

The query returns several columns that you need to expand before you can use them in Power BI. Any entity pulled in using an OData $expand statement returns a record with potentially several fields. You need to expand the record to flatten the entity into its fields. Examples of such entities are: AssignedTo, Iteration, and Area.

After closing the Advanced Editor and while remaining in the Power Query Editor, select the expand button on the entities you need to flatten.

  1. Choose the expand button.

    Power BI + OData - expanding an entity column

  2. Select the fields to flatten.

    Power BI + OData - expanding an entity column

  3. The table now contains entity field(s).

    Power BI + OData - expanding an entity column

  4. Repeat steps 1 through 3 for all fields representing entities: Area, Iteration, AssignedTo.

Rename fields and query, then Close & Apply

When finished, you may choose to rename columns.

  1. Right-click a column header and select Rename...

    Power BI Rename Columns

  2. You also may want to rename the query from the default Query1, to something more meaningful.

    Power BI Rename Query

  3. Once done, choose Close & Apply to save the query and return to Power BI.

    Power BI Close & Apply

Create the report

Power BI shows you the fields you can report on.

Note

The example below assumes that no one renamed any columns.

Sample - Boards Rollup - Fields

For a simple report, perform the following steps:

  1. Select Power BI Visualization Line chart.
  2. Add the field "DateValue" to Axis.
    • Right click "DateValue" and select "DateValue", rather than Date Hierarchy.
  3. Add the field "State" to Legend.
  4. Add the field "Count" to Values.
    • Right click Count field and ensure Sum is selected.

The example report displays.

Sample - Boards Rollup - Report

Pull in data from multiple teams

Oftentimes, you want to aggregate and compare data from multiple teams. If you are pulling in items from multiple teams, consider adding a Team slicer to your report. A Team slicer allows you to filter the existing report by Team Name.

Additional queries

You can use the following additional queries to create different but similar reports using the same steps defined previously in this article.

Filter by Teams, rather than Area Path

You can query for bug trends by Team Name rather than Area Path.

You can paste the Power BI query listed below directly into the Get Data->Blank Query window. For more information, review Overview of sample reports using OData queries.

let
   Source = OData.Feed ("https://analytics.dev.azure.com/{organization}/{project}/_odata/v3.0-preview/WorkItemSnapshot? "
        &"$apply=filter( "
            &"WorkItemType eq 'Bug' "
            &"and State ne 'Closed' "
            &"and (Teams/any(x:x/TeamName eq '{teamname}) or Teams/any(x:x/TeamName eq '{teamname}) or Teams/any(x:x/TeamName eq '{teamname})"
            &"and DateValue ge {startdate}  "
            &") "
        &"/groupby( "
            &"(DateValue,State,WorkItemType,Priority,Severity,Area/AreaPath,Iteration/IterationPath,AreaSK), "
            &"aggregate($count as Count) "
            &") "
    ,null, [Implementation="2.0",OmitValues = ODataOmitValues.Nulls,ODataVersion = 4]) 
in
    Source

Bug trend with a snapshot every Friday

Using a weekly snapshot reduces the amount of data pulled into Power BI, and increases query performance.

You can paste the Power BI query listed below directly into the Get Data->Blank Query window. For more information, review Overview of sample reports using OData queries.

let
   Source = OData.Feed ("https://analytics.dev.azure.com/{organization}/{project}/_odata/v3.0-preview/WorkItemSnapshot? "
        &"$apply=filter( "
            &"WorkItemType eq 'Bug' "
            &"and State ne 'Closed' "
            &"and startswith(Area/AreaPath,'{areapath}') "
            &"and DateValue ge {startdate} "
            &"and Date/DayName eq 'Friday'  "
        &") "
        &"/groupby( "
            &"(DateValue,State,WorkItemType,Priority,Severity,Area/AreaPath,Iteration/IterationPath,AreaSK), "
            &"aggregate($count as Count) "
        &") "
    ,null, [Implementation="2.0",OmitValues = ODataOmitValues.Nulls,ODataVersion = 4]) 
in
    Source

Bug trend with a snapshot on the first of every month

Using a monthly snapshot reduces the amount of data pulled into Power BI, and increases query performance.

You can paste the Power BI query listed below directly into the Get Data->Blank Query window. For more information, review Overview of sample reports using OData queries.

let
   Source = OData.Feed ("https://analytics.dev.azure.com/{organization}/{project}/_odata/v3.0-preview/WorkItemSnapshot? "
        &"$apply=filter( "
            &"WorkItemType eq 'Bug' "
            &"and State ne 'Closed' "
            &"and startswith(Area/AreaPath,'{areapath}') "
            &"and DateValue ge {startdate} "
            &"and Date/DayOfMonth eq 1  "
        &") "
        &"/groupby( "
            &"(DateValue,State,WorkItemType,Priority,Severity,Area/AreaPath,Iteration/IterationPath,AreaSK), "
            &"aggregate($count as Count) "
        &") "
    ,null, [Implementation="2.0",OmitValues = ODataOmitValues.Nulls,ODataVersion = 4]) 
in
    Source

Full list of sample reports