diff --git a/logstash-core/lib/logstash/instrument/metric.rb b/logstash-core/lib/logstash/instrument/metric.rb
index 601c7b0ed..e6e12262a 100644
--- a/logstash-core/lib/logstash/instrument/metric.rb
+++ b/logstash-core/lib/logstash/instrument/metric.rb
@@ -13,7 +13,7 @@ module LogStash module Instrument
   class Metric
     attr_reader :collector
 
-    def initialize(collector = LogStash::Instrument::Collector.instance)
+    def initialize(collector)
       @collector = collector
     end
 
diff --git a/logstash-core/spec/logstash/instrument/collector_spec.rb b/logstash-core/spec/logstash/instrument/collector_spec.rb
index b96be4a5e..2a9979d0c 100644
--- a/logstash-core/spec/logstash/instrument/collector_spec.rb
+++ b/logstash-core/spec/logstash/instrument/collector_spec.rb
@@ -3,7 +3,7 @@ require "logstash/instrument/collector"
 require "spec_helper"
 
 describe LogStash::Instrument::Collector do
-  subject { LogStash::Instrument::Collector.instance }
+  subject { LogStash::Instrument::Collector.new }
   describe "#push" do
     let(:namespaces_path) { [:root, :pipelines, :pipelines01] }
     let(:key) { :my_key }