Support reactor timing metric on more reactors. (#16532)

Previously only Twisted's EPollReactor was compatible with the
reactor timing metric, notably not working when asyncio was used.

After this change, the following configurations support the reactor
timing metric:

* poll, epoll, or select reactors
* asyncio reactor with a poll, epoll, select, /dev/poll, or kqueue event loop.

1 files changed, 1 insertions, 0 deletions

diff --git a/changelog.d/16532.misc b/changelog.d/16532.misc
new file mode 100644
index 0000000000..437e00210b
--- /dev/null
+++ b/changelog.d/16532.misc
@@ -0,0 +1 @@
+Support reactor tick timings on more types of event loops.