Update index.mdx

updating to add parent inheritance to all examples.

Author: sfanahata

docs/platforms/python/tracing/configure-sampling/index.mdx

@@ -53,6 +53,13 @@ It is strongly recommended when using a custom `traces_sampler` that you respect
 
 ```python
 def traces_sampler(sampling_context):
+    # Use the parent sampling decision if we have an incoming trace.
+    # Note: we strongly recommend respecting the parent sampling decision,
+    # as this ensures your traces will be complete!
+    parent_sampling_decision = sampling_context.get("parent_sampled")
+    if parent_sampling_decision is not None:
+        return float(parent_sampling_decision)
+
     ctx = sampling_context.get("transaction_context", {})
     name = ctx.get("name", "")
 
@@ -79,6 +86,13 @@ sentry_sdk.init(
 
 ```python
 def traces_sampler(sampling_context):
+    # Use the parent sampling decision if we have an incoming trace.
+    # Note: we strongly recommend respecting the parent sampling decision,
+    # as this ensures your traces will be complete!
+    parent_sampling_decision = sampling_context.get("parent_sampled")
+    if parent_sampling_decision is not None:
+        return float(parent_sampling_decision)
+
     ctx = sampling_context.get("transaction_context", {})
     environment = os.environ.get("ENVIRONMENT", "development")
 
@@ -108,6 +122,13 @@ sentry_sdk.init(
 
 ```python
 def traces_sampler(sampling_context):
+    # Use the parent sampling decision if we have an incoming trace.
+    # Note: we strongly recommend respecting the parent sampling decision,
+    # as this ensures your traces will be complete!
+    parent_sampling_decision = sampling_context.get("parent_sampled")
+    if parent_sampling_decision is not None:
+        return float(parent_sampling_decision)
+
     ctx = sampling_context.get("transaction_context", {})
     data = ctx.get("data", {})
 
@@ -144,6 +165,13 @@ sentry_sdk.init(
 
 ```python
 def traces_sampler(sampling_context):
+    # Use the parent sampling decision if we have an incoming trace.
+    # Note: we strongly recommend respecting the parent sampling decision,
+    # as this ensures your traces will be complete!
+    parent_sampling_decision = sampling_context.get("parent_sampled")
+    if parent_sampling_decision is not None:
+        return float(parent_sampling_decision)
+
     ctx = sampling_context.get("transaction_context", {})
     data = ctx.get("data", {})
 
@@ -185,6 +213,13 @@ sentry_sdk.init(
 
 ```python
 def traces_sampler(sampling_context):
+    # Use the parent sampling decision if we have an incoming trace.
+    # Note: we strongly recommend respecting the parent sampling decision,
+    # as this ensures your traces will be complete!
+    parent_sampling_decision = sampling_context.get("parent_sampled")
+    if parent_sampling_decision is not None:
+        return float(parent_sampling_decision)
+
     ctx = sampling_context.get("transaction_context", {})
     data = ctx.get("data", {})
 
@@ -284,4 +319,4 @@ The two key headers are:
 - `sentry-trace`: Contains trace ID, span ID, and sampling decision
 - `baggage`: Contains additional trace metadata including sample rate
 
-The Sentry Python SDK automatically attaches these headers to outgoing HTTP requests when using auto-instrumentation with libraries like `requests`, `urllib3`, or `httpx`. For other communication channels, you can manually propagate trace information. Learn more about customizing tracing in [custom trace propagation](/platforms/python/tracing/distributed-tracing/custom-trace-propagation/)
+The Sentry Python SDK automatically attaches these headers to outgoing HTTP requests when using auto-instrumentation with libraries like `requests`, `urllib3`, or `httpx`. For other communication channels, you can manually propagate trace information. Learn more about customizing tracing in [custom trace propagation](/platforms/python/tracing/distributed-tracing/custom-trace-propagation/)