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+# Android Version Notes
+This page documents all the caveats of using Perfetto on older versions of
+Android. Because of the yearly release cycle, it's often the case that a
+feature is shipped but we later discover a bug/problem which makes the feature
+not usable or needs to be used in a very specific way.
+
+## U-
+### New features
+* The CLONE_SNAPSHOT trigger mode was introduced.
+* String field filtering in traces was introduced.
+
+### Caveats
+* On the CLONE_SNAPSHOT codepath, the trace UUID gets rewritten when the session
+  is clone but a statsd atom linking the two is not emitted. This means we
+  should be careful to exclude any "clone-only" sessions as being "failed"
+  sessions.
+
+## T-
+### New features
+* Reporting traces through the framework was introduced.
+
+### Caveats
+* CLONE_SNAPSHOT does not exist in T- but there is a subtle edge case
+  (b/274931668) which means it's quite dangerous to specify CLONE_SNAPSHOT on
+  configs being sent to T- devices.
+
+## P
+### New features
+* Perfetto was included in the system image!
+
+### Caveats
+* --txt option is not supported so configs must be binary encoded.