Don't explode if we have no snapshots yet

2016-07-20 16:59:52 +01:00 · 2016-07-20 16:59:52 +01:00 · d36b1d849d
parent 742056be0d
commit d36b1d849d
1 changed files with 3 additions and 0 deletions
--- a/synapse/metrics/metric.py
+++ b/synapse/metrics/metric.py
@ -180,6 +180,9 @@ class MemoryUsageMetric(object):
        self.memory_snapshots[:] = self.memory_snapshots[-max_size:]

    def render(self):
+        if not self.memory_snapshots:
+            return []
+
        max_rss = max(self.memory_snapshots)
        min_rss = min(self.memory_snapshots)
        sum_rss = sum(self.memory_snapshots)