Fix Rubocop warnings

spec/lib/gitlab/metrics/samplers/ruby_sampler_spec.rb

@@ -50,7 +50,6 @@ describe Gitlab::Metrics::Samplers::RubySampler do
     it 'adds a metric containing garbage collection time statistics' do
       expect(GC::Profiler).to receive(:total_time).and_return(0.24)
 
-
       expect(sampler.metrics[:total_time]).to receive(:set)
                                                 .with({}, 240)
                                                 .and_call_original
@@ -81,7 +80,6 @@ describe Gitlab::Metrics::Samplers::RubySampler do
       it 'ignores classes without a name' do
         expect(Allocations).to receive(:to_hash).and_return({ Class.new => 4 })
 
-
         expect(sampler.metrics[:objects_total]).not_to receive(:set)
                                                          .with(include(class: 'object_counts'), anything)
 

spec/lib/gitlab/metrics/subscribers/action_view_spec.rb

@@ -32,7 +32,6 @@ describe Gitlab::Metrics::Subscribers::ActionView do
     end
 
     it 'observes view rendering time' do
-
       expect(described_class.metric_view_rendering_duration_seconds)
         .to receive(:observe)
               .with({ view: 'app/views/x.html.haml' }, 2.1)

spec/lib/gitlab/metrics/subscribers/rails_cache_spec.rb

@@ -210,7 +210,7 @@ describe Gitlab::Metrics::Subscribers::RailsCache do
       it 'observes cache metric' do
         expect(described_class.metric_cache_operation_duration_seconds)
           .to receive(:observe)
-                .with(transaction.labels.merge(operation: :delete), event.duration/1000.0)
+                .with(transaction.labels.merge(operation: :delete), event.duration / 1000.0)
 
         subscriber.observe(:delete, event.duration)
       end