fixup! Add :most_recent aggregation to DirectFileStore

Author: Daniel Magliola

spec/prometheus/client/data_stores/direct_file_store_spec.rb

@@ -307,23 +307,19 @@
 
       allow(Process).to receive(:pid).and_return(12345)
       metric_store1.set(labels: { foo: "bar" }, val: 1)
+
       allow(Process).to receive(:pid).and_return(23456)
-      metric_store2.set(labels: { foo: "bar" }, val: 3)
-      allow(Process).to receive(:pid).and_return(12345)
-      metric_store1.set(labels: { foo: "baz" }, val: 7)
-      allow(Process).to receive(:pid).and_return(23456)
+      metric_store2.set(labels: { foo: "bar" }, val: 3) # Supercedes 'bar' in PID 12345
       metric_store2.set(labels: { foo: "baz" }, val: 2)
-      allow(Process).to receive(:pid).and_return(12345)
-      metric_store1.set(labels: { foo: "baz" }, val: 4)
-      allow(Process).to receive(:pid).and_return(23456)
       metric_store2.set(labels: { foo: "zzz" }, val: 1)
-      metric_store2.set(labels: { foo: "yyy" }, val: 3)
+
+      allow(Process).to receive(:pid).and_return(12345)
+      metric_store1.set(labels: { foo: "baz" }, val: 4) # Supercedes 'baz' in PID 23456
 
       expect(metric_store1.all_values).to eq(
         { foo: "bar" } => 3.0,
         { foo: "baz" } => 4.0,
         { foo: "zzz" } => 1.0,
-        { foo: "yyy" } => 3.0,
       )
 
       # Both processes should return the same value