diff --git a/changelog.d/9458.misc b/changelog.d/9458.misc
new file mode 100644
index 0000000000..8ceeed1352
--- /dev/null
+++ b/changelog.d/9458.misc
@@ -0,0 +1 @@
+Add tests to ResponseCache.
\ No newline at end of file
diff --git a/changelog.d/9473.bugfix b/changelog.d/9473.bugfix
new file mode 100644
index 0000000000..71fb487cf2
--- /dev/null
+++ b/changelog.d/9473.bugfix
@@ -0,0 +1 @@
+Fix long-standing bug when generating thumbnails for some images with transparency: `TypeError: cannot unpack non-iterable int object`.
diff --git a/changelog.d/9508.doc b/changelog.d/9508.doc
new file mode 100644
index 0000000000..a17a8faecf
--- /dev/null
+++ b/changelog.d/9508.doc
@@ -0,0 +1 @@
+Add relayd entry to reverse proxy example configurations.
diff --git a/changelog.d/9510.feature b/changelog.d/9510.feature
new file mode 100644
index 0000000000..5214b50d41
--- /dev/null
+++ b/changelog.d/9510.feature
@@ -0,0 +1 @@
+Add prometheus metrics for number of users successfully registering and logging in.
diff --git a/changelog.d/9511.feature b/changelog.d/9511.feature
new file mode 100644
index 0000000000..5214b50d41
--- /dev/null
+++ b/changelog.d/9511.feature
@@ -0,0 +1 @@
+Add prometheus metrics for number of users successfully registering and logging in.
diff --git a/changelog.d/9520.misc b/changelog.d/9520.misc
new file mode 100644
index 0000000000..825ba5bbc1
--- /dev/null
+++ b/changelog.d/9520.misc
@@ -0,0 +1 @@
+Add type hints to purge room and server notice admin API.
\ No newline at end of file
diff --git a/changelog.d/9523.misc b/changelog.d/9523.misc
new file mode 100644
index 0000000000..f03e939efb
--- /dev/null
+++ b/changelog.d/9523.misc
@@ -0,0 +1 @@
+Add extra logging to ObservableDeferred when callbacks throw exceptions.
\ No newline at end of file
diff --git a/changelog.d/9528.misc b/changelog.d/9528.misc
new file mode 100644
index 0000000000..14c7b78dd9
--- /dev/null
+++ b/changelog.d/9528.misc
@@ -0,0 +1 @@
+Fix incorrect type hints.
diff --git a/changelog.d/9540.feature b/changelog.d/9540.feature
new file mode 100644
index 0000000000..5417e51b93
--- /dev/null
+++ b/changelog.d/9540.feature
@@ -0,0 +1 @@
+Add `synapse_federation_last_sent_pdu_time` and `synapse_federation_last_received_pdu_time` prometheus metrics, which monitor federation delays by reporting the timestamps of messages sent and received to a set of remote servers.
diff --git a/changelog.d/9540.removal b/changelog.d/9540.removal
new file mode 100644
index 0000000000..d54f553cb9
--- /dev/null
+++ b/changelog.d/9540.removal
@@ -0,0 +1 @@
+The `synapse_federation_last_sent_pdu_age` and `synapse_federation_last_received_pdu_age` prometheus metrics have been removed. They are replaced by `synapse_federation_last_sent_pdu_time` and `synapse_federation_last_received_pdu_time`.
diff --git a/changelog.d/9541.misc b/changelog.d/9541.misc
new file mode 100644
index 0000000000..a82bef3431
--- /dev/null
+++ b/changelog.d/9541.misc
@@ -0,0 +1 @@
+Add an additional test for purging a room.
diff --git a/changelog.d/9543.misc b/changelog.d/9543.misc
new file mode 100644
index 0000000000..14c7b78dd9
--- /dev/null
+++ b/changelog.d/9543.misc
@@ -0,0 +1 @@
+Fix incorrect type hints.
diff --git a/changelog.d/9549.feature b/changelog.d/9549.feature
new file mode 100644
index 0000000000..709e61eced
--- /dev/null
+++ b/changelog.d/9549.feature
@@ -0,0 +1 @@
+Add support for generating JSON Web Tokens dynamically for use as OIDC client secrets.
diff --git a/changelog.d/9550.doc b/changelog.d/9550.doc
new file mode 100644
index 0000000000..adbbeb0ae4
--- /dev/null
+++ b/changelog.d/9550.doc
@@ -0,0 +1 @@
+Improve the SAML2 upgrade notes for 1.27.0.
diff --git a/changelog.d/9559.removal b/changelog.d/9559.removal
new file mode 100644
index 0000000000..f97bf56dc0
--- /dev/null
+++ b/changelog.d/9559.removal
@@ -0,0 +1 @@
+Registering an Application Service user without using the `m.login.application_service` login type will be unsupported in an upcoming Synapse release.
diff --git a/changelog.d/9560.misc b/changelog.d/9560.misc
new file mode 100644
index 0000000000..57a698f846
--- /dev/null
+++ b/changelog.d/9560.misc
@@ -0,0 +1 @@
+Add a `.git-blame-ignore-revs` file with the hashes of auto-formatting.
diff --git a/changelog.d/9562.misc b/changelog.d/9562.misc
new file mode 100644
index 0000000000..2f0133bff0
--- /dev/null
+++ b/changelog.d/9562.misc
@@ -0,0 +1 @@
+Fix spurious errors reported by the `config-lint.sh` script.
\ No newline at end of file
diff --git a/changelog.d/9567.bugfix b/changelog.d/9567.bugfix
new file mode 100644
index 0000000000..e7322c2b5e
--- /dev/null
+++ b/changelog.d/9567.bugfix
@@ -0,0 +1 @@
+Fix bug where federation requests were not correctly retried on 5xx responses.
diff --git a/changelog.d/9571.doc b/changelog.d/9571.doc
new file mode 100644
index 0000000000..1bba72e7d0
--- /dev/null
+++ b/changelog.d/9571.doc
@@ -0,0 +1 @@
+Link to the "List user's media" admin API from the media admin API docs.
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