Enable log injection by default

Author: DarcyRaynerDD

README.md

@@ -85,7 +85,7 @@ If your Lambda function powers a performance-critical task (e.g., a consumer-fac
 
 - DD_FLUSH_TO_LOG
 
-To connect logs and traces, set the environment variable below to `True`. The default format of the AWS provided `LambdaLoggerHandler` will be overridden to inject `dd.trace_id` and `dd.span_id`. The default Datadog lambda log integration pipeline will automatically parse them and map the `dd.trace_id` into the reserved [trace_id attribute](https://docs.datadoghq.com/logs/processing/#trace-id-attribute).
+To connect logs and traces, set the environment variable below to `True`. The default format of the AWS provided `LambdaLoggerHandler` will be overridden to inject `dd.trace_id` and `dd.span_id`. The default Datadog lambda log integration pipeline will automatically parse them and map the `dd.trace_id` into the reserved [trace_id attribute](https://docs.datadoghq.com/logs/processing/#trace-id-attribute). Defaults to true.
 
 - DD_LOGS_INJECTION
 

datadog_lambda/wrapper.py

@@ -47,7 +47,9 @@ class _LambdaDecorator(object):
     def __init__(self, func):
         self.func = func
         self.flush_to_log = os.environ.get("DD_FLUSH_TO_LOG", "").lower() == "true"
-        self.logs_injection = os.environ.get("DD_LOGS_INJECTION", "").lower() == "true"
+        self.logs_injection = (
+            os.environ.get("DD_LOGS_INJECTION", "true").lower() == "true"
+        )
 
         # Inject trace correlation ids to logs
         if self.logs_injection: