diff --git a/synapse/metrics/__init__.py b/synapse/metrics/__init__.py
index d5c30bbe41..d7584fc0bc 100644
--- a/synapse/metrics/__init__.py
+++ b/synapse/metrics/__init__.py
@@ -13,7 +13,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
-from .metric import CounterMetric, CacheCounterMetric
+from .metric import CounterMetric, CallbackMetric, CacheCounterMetric
# We'll keep all the available metrics in a single toplevel dict, one shared
@@ -43,6 +43,15 @@ class Metrics(object):
return metric
+ def register_callback(self, name, callback, *args, **kwargs):
+ full_name = "%s.%s" % (self.name_prefix, name)
+
+ metric = CallbackMetric(full_name, *args, callback=callback, **kwargs)
+
+ self._register(metric)
+
+ return metric
+
def register_cachecounter(self, name, *args, **kwargs):
full_name = "%s.%s" % (self.name_prefix, name)
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