diff --git a/lib/gitlab/gitaly_client.rb b/lib/gitlab/gitaly_client.rb
index 66666b88c15d54dff7140d5b4bd2d360dbf71059..9be553a8b863397e6163f19b307f532607a6c204 100644
--- a/lib/gitlab/gitaly_client.rb
+++ b/lib/gitlab/gitaly_client.rb
@@ -296,15 +296,14 @@ module Gitlab
     def self.add_call_details(details)
       return unless Gitlab::SafeRequestStore[:peek_enabled]
 
-      Gitlab::SafeRequestStore['gitaly_call_details'] ||= {}
-      Gitlab::SafeRequestStore['gitaly_call_details'][id] ||= {}
-      Gitlab::SafeRequestStore['gitaly_call_details'][id].merge!(details)
+      Gitlab::SafeRequestStore['gitaly_call_details'] ||= []
+      Gitlab::SafeRequestStore['gitaly_call_details'] << details
     end
 
     def self.list_call_details
-      return {} unless Gitlab::SafeRequestStore[:peek_enabled]
+      return [] unless Gitlab::SafeRequestStore[:peek_enabled]
 
-      Gitlab::SafeRequestStore['gitaly_call_details'] || {}
+      Gitlab::SafeRequestStore['gitaly_call_details'] || []
     end
 
     def self.expected_server_version
diff --git a/lib/peek/views/gitaly.rb b/lib/peek/views/gitaly.rb
index 860963ef94fde8834c31b57f283c364c5ae11bdc..30f95a1002492b5f0ca9bf394a51d78bf421e71c 100644
--- a/lib/peek/views/gitaly.rb
+++ b/lib/peek/views/gitaly.rb
@@ -23,7 +23,6 @@ module Peek
 
       def details
         ::Gitlab::GitalyClient.list_call_details
-          .values
           .sort { |a, b| b[:duration] <=> a[:duration] }
           .map(&method(:format_call_details))
       end
diff --git a/spec/lib/gitlab/gitaly_client_spec.rb b/spec/lib/gitlab/gitaly_client_spec.rb
index 3ae319456da1283e901d738de5f51e93890619ae..5eda4d041a8fc47492b0d4d405f4c41164e159c2 100644
--- a/spec/lib/gitlab/gitaly_client_spec.rb
+++ b/spec/lib/gitlab/gitaly_client_spec.rb
@@ -216,4 +216,29 @@ describe Gitlab::GitalyClient do
       end
     end
   end
+
+  describe 'Peek Performance bar details' do
+    let(:gitaly_server) { Gitaly::Server.all.first }
+
+    before do
+      Gitlab::SafeRequestStore[:peek_enabled] = true
+    end
+
+    context 'when the request store is active', :request_store do
+      it 'records call details if a RPC is called' do
+        gitaly_server.server_version
+
+        expect(described_class.list_call_details).not_to be_empty
+        expect(described_class.list_call_details.size).to be(1)
+      end
+    end
+
+    context 'when no request store is active' do
+      it 'records nothing' do
+        gitaly_server.server_version
+
+        expect(described_class.list_call_details).to be_empty
+      end
+    end
+  end
 end