Use revision instead of build number for TC query.

app/models/project_services/teamcity_service.rb

@@ -39,9 +39,7 @@ class TeamcityService < CiService
   end
 
   def help
-    'The build configuration in Teamcity must use the build format '\
-    'number %build.vcs.number% '\
-    'you will also want to configure monitoring of all branches so merge '\
+    'You will want to configure monitoring of all branches so merge '\
     'requests build, that setting is in the vsc root advanced settings.'
   end
 
@@ -70,7 +68,7 @@ class TeamcityService < CiService
   end
 
   def calculate_reactive_cache(sha, ref)
-    response = get_path("httpAuth/app/rest/builds/branch:unspecified:any,number:#{sha}")
+    response = get_path("httpAuth/app/rest/builds/branch:unspecified:any,revision:#{sha}")
 
     { build_page: read_build_page(response), commit_status: read_commit_status(response) }
   end

changelogs/unreleased/55495-teamcity-use-revision-in-query.yml

+---
+title: Build number does not need to be tweaked anymore for the TeamCity integration to work properly.
+merge_request: 23898
+author:
+type: changed

spec/models/project_services/teamcity_service_spec.rb

@@ -205,7 +205,7 @@ describe TeamcityService, :use_clean_rails_memory_store_caching do
   end
 
   def stub_request(status: 200, body: nil, build_status: 'success')
-    teamcity_full_url = 'http://gitlab.com/teamcity/httpAuth/app/rest/builds/branch:unspecified:any,number:123'
+    teamcity_full_url = 'http://gitlab.com/teamcity/httpAuth/app/rest/builds/branch:unspecified:any,revision:123'
     auth = %w(mic password)
 
     body ||= %Q({"build":{"status":"#{build_status}","id":"666"}})