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-rw-r--r--spec/support/prometheus/metric_builders.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/spec/support/prometheus/metric_builders.rb b/spec/support/prometheus/metric_builders.rb
index c8d056d3fc8..512e32a44d0 100644
--- a/spec/support/prometheus/metric_builders.rb
+++ b/spec/support/prometheus/metric_builders.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
module Prometheus
module MetricBuilders
def simple_query(suffix = 'a', **opts)