diff --git a/notifier/spec/fixtures/migration-testing/expected-comment.txt b/notifier/spec/fixtures/migration-testing/expected-comment.txt
index d5d0e224c40b02ca0f396cb033fd8393baabb56b..350c9912415a9cd94de46252972eb461dd1552fe 100644
--- a/notifier/spec/fixtures/migration-testing/expected-comment.txt
+++ b/notifier/spec/fixtures/migration-testing/expected-comment.txt
@@ -103,6 +103,7 @@ Migrations included in this change have been executed on gitlab.com data for tes
 
   | Migration | Type | Total runtime | Result | DB size change |
 | --------- | ---- | ------------- | ------ | -------------- |
+| 20210601233122 - UnrelatedMigration | Regular | 10000.0 s | :warning: | +0.00 B |
 
 </details>
 
diff --git a/notifier/spec/fixtures/migration-testing/migration-stats.json b/notifier/spec/fixtures/migration-testing/migration-stats.json
index 4320d5b448624bd4ff55653a9239fa811a639d19..ae821b4d43d4d7479907bec1820687841448a2a9 100644
--- a/notifier/spec/fixtures/migration-testing/migration-stats.json
+++ b/notifier/spec/fixtures/migration-testing/migration-stats.json
@@ -606,5 +606,21 @@
         "rows": 0
       }
     ]
+  },
+  {
+    "migration": 20210601233122,
+    "walltime": 10000,
+    "success": true,
+    "total_database_size_change": 0,
+    "query_statistics": [
+      {
+        "query": "select pg_database_size(current_database()) /*application:test*/",
+        "calls": 1,
+        "total_time": 84.903616,
+        "max_time": 84.903616,
+        "mean_time": 84.903616,
+        "rows": 1
+      }
+    ]
   }
 ]
diff --git a/notifier/spec/fixtures/migration-testing/migrations.json b/notifier/spec/fixtures/migration-testing/migrations.json
index 11faadc170e543e7a759343406f15df0bd28f6e0..b04a25c2f17af1c04a66c9dba1bf78e2d161a9d8 100644
--- a/notifier/spec/fixtures/migration-testing/migrations.json
+++ b/notifier/spec/fixtures/migration-testing/migrations.json
@@ -19,5 +19,12 @@
     "name": "CreateTestTable",
     "type": "regular",
     "intro_on_current_branch": true
+  },
+  "20210601233122": {
+    "version": 20210601233122,
+    "path": "db/migrate/20210601233122_unrelated_migration.rb",
+    "name": "UnrelatedMigration",
+    "type": "regular",
+    "intro_on_current_branch": false
   }
 }
diff --git a/notifier/spec/warnings_spec.rb b/notifier/spec/warnings_spec.rb
index 9d414cee360a883310b495e0ab456246ce3c5c53..4060077457270d2c0767af0223b4bb39b26bb2de 100644
--- a/notifier/spec/warnings_spec.rb
+++ b/notifier/spec/warnings_spec.rb
@@ -31,5 +31,11 @@ RSpec.describe Warnings do
       expect(subject.render).to include('should not exceed 100ms')
       expect(subject.render).to include('222.49203')
     end
+
+    it 'excludes migrations not introduced on current branch' do
+      excluded_name = 'UnrelatedMigration'
+      expect(result.other_migrations.map(&:name)).to include(excluded_name)
+      expect(subject.render).not_to include(excluded_name)
+    end
   end
 end
diff --git a/notifier/warnings.rb b/notifier/warnings.rb
index 72976b29f1e97ed3b7c2a133ea19725c2f054961..8e2b9484f22ab980f518c9aa5b509c937c71419d 100644
--- a/notifier/warnings.rb
+++ b/notifier/warnings.rb
@@ -4,7 +4,7 @@ class Warnings
   attr_reader :all
 
   def initialize(result)
-    @all = result.migrations.values.select(&:warning?).map(&:warnings).flatten
+    @all = result.migrations_from_branch.select(&:warning?).map(&:warnings).flatten
   end
 
   def count