release: ChangeLog and ReleaseNotes for 0.4.7.4-alpha

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+Changes in version 0.4.7.4-alpha - 2022-02-25
+  This version contains the negotiation congestion control work which is the
+  final part needed before going stable. There are also various bugfixes
+  including two major ones detailed below. Last, the Exit notice page layout
+  has been modernized but the text is unchanged. We recommend that all relay
+  operators running any previous alpha upgrade to this one.
+
+  o Major features (relay, client, onion services):
+    - Implement RTT-based congestion control for exits and onion
+      services, from Proposal 324. Disabled by default. Enabled by the
+      'cc_alg' consensus parameter. Closes ticket 40444.
+
+  o Major bugfixes (client):
+    - Stop caching TCP connect failures to relays/bridges when we
+      initiated the connection as a client. Now we only cache connect
+      failures as a relay or bridge when we initiated them because of an
+      EXTEND request. Declining to re-attempt the client-based
+      connections could cause problems when we lose connectivity and try
+      to reconnect. Fixes bug 40499; bugfix on 0.3.3.4-alpha.
+
+  o Major bugfixes (relay, overload):
+    - Do not trigger a general overload on DNS timeout. Even after
+      fixing 40527, some code remained that triggered the overload.
+      Fixes bug 40564; bugfix on 0.4.7.1-alpha.
+
+  o Minor feature (authority, relay):
+    - Reject End-Of-Life relays running version 0.3.5.x. Closes
+      ticket 40559.
+
+  o Minor features (fallbackdir):
+    - Regenerate fallback directories generated on February 25, 2022.
+
+  o Minor features (geoip data):
+    - Update the geoip files to match the IPFire Location Database, as
+      retrieved on 2022/02/25.
+
+  o Minor bugfix (logging):
+    - Update a log notice dead URL to a working one. Fixes bug 40544;
+      bugfix on 0.3.5.1-alpha.
+
+  o Minor bugfix (relay):
+    - Remove the HSDir and HSIntro onion service v2 protocol versions so
+      relay stop advertising that they support them. Fixes bug 40509;
+      bugfix on 0.3.5.17.
+
+  o Minor bugfixes (cell scheduling):
+    - Avoid writing empty payload with NSS write.
+    - Don't attempt to write 0 bytes after a cell scheduling loop. No
+      empty payload was put on the wire. Fixes bug 40548; bugfix
+      on 0.3.5.1-alpha.
+
+  o Minor bugfixes (compilation):
+    - Resume being able to build on old / esoteric gcc versions. Fixes
+      bug 40550; bugfix on 0.4.7.1-alpha.
+
+  o Minor bugfixes (compiler warnings):
+    - Fix couple compiler warnings on latest Ubuntu Jammy. Fixes bug
+      40516; bugfix on 0.3.5.1-alpha.
+
+  o Documentation:
+    - Provide an improved version of the tor-exit-notice.html file for
+      exit relays to use as a landing page. The text is unchanged, but
+      the page design and layout are significantly modernized, and
+      several links are fixed. Patch from "n_user"; closes ticket 40529.
+
+
 Changes in version 0.4.6.10 - 2022-02-04
   This version contains minor bugfixes but one in particular is that relays
   don't advertise onion service v2 support at the protocol version level.