add set_measurement

Author: sentrivana

docs/platforms/python/migration/2.x-to-3.x.mdx

@@ -181,6 +181,11 @@ The PyMongo integration doesn't set `operation_ids` anymore. The individual IDs
 In Redis pipeline spans, there is no `span["data"]["redis.commands"]` that contains a dictionary `{"count": 3, "first_ten": ["cmd1", "cmd2", ...]}`. Instead, there is `span["data"]["redis.commands.count"]` (containing `3`) and `span["data"]["redis.commands.first_ten"]` (containing `["cmd1", "cmd2", ...]`).
 
 
+## Measurements
+
+The `set_measurement()` API was removed. You can set custom attributes on the span instead with `set_attribute()`.
+
+
 ## Sessions
 
 The `auto_session_tracking()` context manager was removed. Use `track_session()` instead.