# File lib/new_relic/agent/samplers/vm_sampler.rb, line 52
        def record_gc_runs_metric(snapshot, txn_count) #THREAD_LOCAL_ACCESS
          if snapshot.gc_total_time || snapshot.gc_runs
            if snapshot.gc_total_time
              gc_time = snapshot.gc_total_time - @last_snapshot.gc_total_time.to_f
            end
            if snapshot.gc_runs
              gc_runs = snapshot.gc_runs - @last_snapshot.gc_runs
            end
            wall_clock_time = snapshot.taken_at - @last_snapshot.taken_at
            NewRelic::Agent.agent.stats_engine.tl_record_unscoped_metrics(GC_RUNS_METRIC) do |stats|
              stats.call_count           += txn_count
              stats.total_call_time      += gc_runs if gc_runs
              stats.total_exclusive_time += gc_time if gc_time
              stats.max_call_time         = (gc_time.nil? ? 0 : 1)
              stats.sum_of_squares       += wall_clock_time
            end
          end
        end