DEV: Allow raw PG tracing to be enabled only for sidekiq processes

config/initializers/000-trace_pg_connections.rb

@@ -4,6 +4,9 @@
 # to be streamed to files for debugging. The filenames are formatted
 # like tmp/pgtrace/{{PID}}_{{CONNECTION_OBJECT_ID}}.txt
 #
+# Setting TRACE_PG_CONNECTIONS=SIDEKIQ will only trace connections
+# on in sidekiq (safer, because there will be minimal user-facing perf impact)
+#
 # Files will be automatically deleted when the connection is closed gracefully
 # (e.g. when activerecord closes it after a period of inactivity)
 # Files will not be automatically deleted when closed abruptly
@@ -17,6 +20,7 @@ if ENV["TRACE_PG_CONNECTIONS"]
 
     def initialize(*args)
       super(*args).tap do
+        next if ENV["TRACE_PG_CONNECTIONS"] == "SIDEKIQ" && !Sidekiq.server?
         FileUtils.mkdir_p(TRACE_DIR)
         @trace_filename = "#{TRACE_DIR}/#{Process.pid}_#{self.object_id}.txt"
         trace File.new(@trace_filename, "w")
@@ -25,6 +29,7 @@ if ENV["TRACE_PG_CONNECTIONS"]
 
     def close
       super.tap do
+        next if ENV["TRACE_PG_CONNECTIONS"] == "SIDEKIQ" && !Sidekiq.server?
         File.delete(@trace_filename)
       end
     end