From 36c426e294a53d2192cc9f29ec5c93e84e222228 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Wed, 16 Jun 2021 13:29:54 +0100
Subject: [PATCH] Add debug logging when we enter/exit Measure block (#10183)
It can be helpful to know when trying to track down slow requests.
---
changelog.d/10183.misc | 1 +
synapse/util/metrics.py | 5 +++++
2 files changed, 6 insertions(+)
create mode 100644 changelog.d/10183.misc
diff --git a/changelog.d/10183.misc b/changelog.d/10183.misc
new file mode 100644
index 0000000000..c0e01ad3db
--- /dev/null
+++ b/changelog.d/10183.misc
@@ -0,0 +1 @@
+Add debug logging for when we enter and exit `Measure` blocks.
diff --git a/synapse/util/metrics.py b/synapse/util/metrics.py
index 6d14351bd2..45353d41c5 100644
--- a/synapse/util/metrics.py
+++ b/synapse/util/metrics.py
@@ -133,12 +133,17 @@ class Measure:
self.start = self.clock.time()
self._logging_context.__enter__()
in_flight.register((self.name,), self._update_in_flight)
+
+ logger.debug("Entering block %s", self.name)
+
return self
def __exit__(self, exc_type, exc_val, exc_tb):
if self.start is None:
raise RuntimeError("Measure() block exited without being entered")
+ logger.debug("Exiting block %s", self.name)
+
duration = self.clock.time() - self.start
usage = self.get_resource_usage()
--
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