move entirely to BlobFile

config/initializers/prometheus_exporter.rb

@@ -40,6 +40,28 @@ else
   # connect to a Prometheus server, which we can't rely on in a test environment.
   $stderr.puts "PrometheusExporter is disabled in test, console, and rake task environments"
   module PrometheusExporter
+    module Instrumentation
+      class PeriodicStats
+        class << self
+          extend T::Sig
+          sig do
+            params(
+              args: T.untyped,
+              frequency: T.untyped,
+              client: T.untyped,
+              kwargs: T.untyped,
+            ).void
+          end
+          def start(*args, frequency:, client: T.unsafe(nil), **kwargs)
+          end
+
+          sig { params(blk: T.proc.void).void }
+          def worker_loop(&blk)
+          end
+        end
+      end
+    end
+
     class Client
       class RemoteMetric
       end