Fix #2536: Add CREWAI_DISABLE_TELEMETRY environment variable

Co-Authored-By: Joe Moura <joao@crewai.com>

docs/telemetry.mdx

@@ -22,7 +22,7 @@ usage of tools, API calls, responses, any data processed by the agents, or secre
 When the `share_crew` feature is enabled, detailed data including task descriptions, agents' backstories or goals, and other specific attributes are collected 
 to provide deeper insights. This expanded data collection may include personal information if users have incorporated it into their crews or tasks. 
 Users should carefully consider the content of their crews and tasks before enabling `share_crew`. 
-Users can disable telemetry by setting the environment variable `OTEL_SDK_DISABLED` to `true`.
+Users can disable telemetry by setting the environment variable `CREWAI_DISABLE_TELEMETRY` to `true` or by setting `OTEL_SDK_DISABLED` to `true` (note that the latter disables all OpenTelemetry instrumentation globally).
 
 ### Data Explanation:
 | Defaulted | Data                                      | Reason and Specifics                                                                                                       |
@@ -55,4 +55,4 @@ This enables a deeper insight into usage patterns.
 <Warning>
     If you enable `share_crew`, the collected data may include personal information if it has been incorporated into crew configurations, task descriptions, or outputs. 
     Users should carefully review their data and ensure compliance with GDPR and other applicable privacy regulations before enabling this feature.
-</Warning>
+</Warning>

src/crewai/telemetry/telemetry.py

@@ -48,7 +48,8 @@ class Telemetry:
         self.ready = False
         self.trace_set = False
 
-        if os.getenv("OTEL_SDK_DISABLED", "false").lower() == "true":
+        if (os.getenv("OTEL_SDK_DISABLED", "false").lower() == "true" or
+            os.getenv("CREWAI_DISABLE_TELEMETRY", "false").lower() == "true"):
             return
 
         try:

tests/telemetry/test_telemetry_disable.py

@@ -0,0 +1,27 @@
+import os
+import pytest
+from unittest.mock import patch
+
+from crewai.telemetry import Telemetry
+
+
+def test_telemetry_disabled_with_otel_sdk_disabled():
+    """Test that telemetry is disabled when OTEL_SDK_DISABLED is set to true."""
+    with patch.dict(os.environ, {"OTEL_SDK_DISABLED": "true"}):
+        telemetry = Telemetry()
+        assert telemetry.ready is False
+
+
+def test_telemetry_disabled_with_crewai_disable_telemetry():
+    """Test that telemetry is disabled when CREWAI_DISABLE_TELEMETRY is set to true."""
+    with patch.dict(os.environ, {"CREWAI_DISABLE_TELEMETRY": "true"}):
+        telemetry = Telemetry()
+        assert telemetry.ready is False
+
+
+def test_telemetry_enabled_by_default():
+    """Test that telemetry is enabled by default."""
+    with patch.dict(os.environ, {}, clear=True):
+        with patch("crewai.telemetry.telemetry.TracerProvider"):
+            telemetry = Telemetry()
+            assert telemetry.ready is True