Set minimum latency to be non-negative number.

Sometimes the tests run so fast latency is calculated as 0.
This causes transient failures in our CI.

spec/lib/gitlab/health_checks/fs_shards_check_spec.rb

@@ -82,9 +82,9 @@ describe Gitlab::HealthChecks::FsShardsCheck do
         it { is_expected.to include(metric_class.new(:filesystem_readable, 0, shard: :default)) }
         it { is_expected.to include(metric_class.new(:filesystem_writable, 0, shard: :default)) }
-        it { is_expected.to include(have_attributes(name: :filesystem_access_latency, value: be > 0, labels: { shard: :default })) }
-        it { is_expected.to include(have_attributes(name: :filesystem_read_latency, value: be > 0, labels: { shard: :default })) }
-        it { is_expected.to include(have_attributes(name: :filesystem_write_latency, value: be > 0, labels: { shard: :default })) }
+        it { is_expected.to include(have_attributes(name: :filesystem_access_latency, value: be >= 0, labels: { shard: :default })) }
+        it { is_expected.to include(have_attributes(name: :filesystem_read_latency, value: be >= 0, labels: { shard: :default })) }
+        it { is_expected.to include(have_attributes(name: :filesystem_write_latency, value: be >= 0, labels: { shard: :default })) }
       end
       context 'storage points to directory that has both read and write rights' do
@@ -96,9 +96,9 @@ describe Gitlab::HealthChecks::FsShardsCheck do
         it { is_expected.to include(metric_class.new(:filesystem_readable, 1, shard: :default)) }
         it { is_expected.to include(metric_class.new(:filesystem_writable, 1, shard: :default)) }
-        it { is_expected.to include(have_attributes(name: :filesystem_access_latency, value: be > 0, labels: { shard: :default })) }
-        it { is_expected.to include(have_attributes(name: :filesystem_read_latency, value: be > 0, labels: { shard: :default })) }
-        it { is_expected.to include(have_attributes(name: :filesystem_write_latency, value: be > 0, labels: { shard: :default })) }
+        it { is_expected.to include(have_attributes(name: :filesystem_access_latency, value: be >= 0, labels: { shard: :default })) }
+        it { is_expected.to include(have_attributes(name: :filesystem_read_latency, value: be >= 0, labels: { shard: :default })) }
+        it { is_expected.to include(have_attributes(name: :filesystem_write_latency, value: be >= 0, labels: { shard: :default })) }
       end
     end
   end

spec/lib/gitlab/health_checks/simple_check_shared.rb

@@ -8,7 +8,7 @@ shared_context 'simple_check' do |metrics_prefix, check_name, success_result|
       it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_success", value: 1)) }
       it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_timeout", value: 0)) }
-      it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_latency", value: be > 0)) }
+      it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_latency", value: be >= 0)) }
     end
     context 'Check is misbehaving' do
@@ -18,7 +18,7 @@ shared_context 'simple_check' do |metrics_prefix, check_name, success_result|
       it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_success", value: 0)) }
       it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_timeout", value: 0)) }
-      it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_latency", value: be > 0)) }
+      it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_latency", value: be >= 0)) }
     end
     context 'Check is timeouting' do
@@ -28,7 +28,7 @@ shared_context 'simple_check' do |metrics_prefix, check_name, success_result|
       it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_success", value: 0)) }
       it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_timeout", value: 1)) }
-      it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_latency", value: be > 0)) }
+      it { is_expected.to include(have_attributes(name: "#{metrics_prefix}_latency", value: be >= 0)) }
     end
   end