Viewing Current Problems
To view problematic build configurations and tests in your project, open the Project Home page and go to the Current Problems tab.
In this section you will read about:
Using Current Problems Tab
By default, the Current Problems tab displays data for all build configurations within a project. To limit the data displayed, use the Filter by build configuration drop-down.
From this page you can view problems in your project divided into the following groups:
build configuration problems,
failed tests,
build problems.
Each of the sections is expandable, and you can further drill down to the smallest relevant item using the up and down arrows 
.
The links appearing in build configuration problems and build problems sections enable you to monitor a great deal of useful data, e.g. you can navigate to build results, view build log, changes, etc. More options are available when you click the arrow next to a link.
The failed test and muted failures sections have grouping options and allow viewing the test stacktrace available when clicking the test name link. You can also view the test history, open the test in the active IDE, start investigating a particular test failure, fix and unmute a test or start investigating a particular test failure.
You can also view all tests failed within the last 120 hours for the whole project or a particular build configuration using the corresponding link on the right of the page. For details, refer to the section below.
Veiwing Problems on Overview Page
Starting with TeamCity 7.1, you can see the number of tests failed in build configurations as well as other problems right on the Overview page. 
With the problematic build configuration is not expanded, the link under the tests takes you to the Current Problems page. When you expand the build configuration data, the problem summary appears. The presentation of problems is shortened if your browser does not have enough horizontal space.
Viewing Tests Failed within Last 120 Hours
To view all tests failed within the last 120 hours for a project, navigate to the Project Home page, select the Current Problems tab and click the View all tests failed within the last 120 hours link. The Problematic Tests tab is opened. To view problematic tests for a specific build configuration, use the Show problematic tests for drop-down list.
For each test you can view the total number of test runs, the failure count and last time the test failed.
Clicking the test details icon 
opens the Test History tab with filterable data pertaining to the test.