fix: disable connection reuse by default (#3440) (#3448)

(cherry picked from commit 405fd20)

Co-authored-by: Tahir H. Butt <[email protected]>

Author: mergify[bot]

ddtrace/internal/writer.py

@@ -57,7 +57,7 @@
 DEFAULT_BUFFER_SIZE = 8 << 20  # 8 MB
 DEFAULT_MAX_PAYLOAD_SIZE = 8 << 20  # 8 MB
 DEFAULT_PROCESSING_INTERVAL = 1.0
-DEFAULT_REUSE_CONNECTIONS = True
+DEFAULT_REUSE_CONNECTIONS = False
 
 
 def get_writer_buffer_size():

releasenotes/notes/keep-alive-b5ec5febb435daad.yaml

@@ -1,4 +1,4 @@
 ---
 features:
   - |
-    HTTP connections for trace payloads to the agent will be reused when possible.
+    Add support to reuse HTTP connections when sending trace payloads to the agent. This feature is disabled by default. Set ``DD_TRACE_WRITER_REUSE_CONNECTIONS=true`` to enable this feature.