From 84fac0f814f69645ff1ad564ef8294b31203dc95 Mon Sep 17 00:00:00 2001
From: Sean Quah <8349537+squahtx@users.noreply.github.com>
Date: Wed, 17 Nov 2021 19:07:02 +0000
Subject: Add type annotations to `synapse.metrics` (#10847)

---
 synapse/metrics/jemalloc.py | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

(limited to 'synapse/metrics/jemalloc.py')

diff --git a/synapse/metrics/jemalloc.py b/synapse/metrics/jemalloc.py
index 29ab6c0229..98ed9c0829 100644
--- a/synapse/metrics/jemalloc.py
+++ b/synapse/metrics/jemalloc.py
@@ -16,14 +16,16 @@ import ctypes
 import logging
 import os
 import re
-from typing import Optional
+from typing import Iterable, Optional
+
+from prometheus_client import Metric
 
 from synapse.metrics import REGISTRY, GaugeMetricFamily
 
 logger = logging.getLogger(__name__)
 
 
-def _setup_jemalloc_stats():
+def _setup_jemalloc_stats() -> None:
     """Checks to see if jemalloc is loaded, and hooks up a collector to record
     statistics exposed by jemalloc.
     """
@@ -135,7 +137,7 @@ def _setup_jemalloc_stats():
     class JemallocCollector:
         """Metrics for internal jemalloc stats."""
 
-        def collect(self):
+        def collect(self) -> Iterable[Metric]:
             _jemalloc_refresh_stats()
 
             g = GaugeMetricFamily(
@@ -185,7 +187,7 @@ def _setup_jemalloc_stats():
     logger.debug("Added jemalloc stats")
 
 
-def setup_jemalloc_stats():
+def setup_jemalloc_stats() -> None:
     """Try to setup jemalloc stats, if jemalloc is loaded."""
 
     try:
-- 
cgit 1.4.1