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-rw-r--r--synapse/metrics/metric.py8
1 files changed, 6 insertions, 2 deletions
diff --git a/synapse/metrics/metric.py b/synapse/metrics/metric.py
index e8c15a60e8..4df5ebfda6 100644
--- a/synapse/metrics/metric.py
+++ b/synapse/metrics/metric.py
@@ -79,9 +79,13 @@ class CallbackMetric(BaseMetric):
         self.callback = callback
 
     def render(self):
-        # TODO(paul): work out something we can do with keys and vectors
-        return ["%s %d" % (self.name, self.callback())]
+        value = self.callback()
 
+        if self.is_scalar():
+            return ["%s %d" % (self.name, value)]
+
+        return ["%s{%s} %d" % (self.name, self._render_key(k), value[k])
+                for k in sorted(value.keys())]
 
 class CacheMetric(object):
     """A combination of two CounterMetrics, one to count cache hits and one to