From 3147caacb8a736d810a12987764cd2ca8ef207bd Mon Sep 17 00:00:00 2001
From: Peter Giacomo Lombardo <pglombardo@gmail.com>
Date: Mon, 24 Jun 2019 23:38:41 +0200
Subject: [PATCH 1/3] Validate min redis version before instrumenting

---
 instana/instrumentation/redis.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/instana/instrumentation/redis.py b/instana/instrumentation/redis.py
index f8eb4605..8c95ec55 100644
--- a/instana/instrumentation/redis.py
+++ b/instana/instrumentation/redis.py
@@ -8,7 +8,7 @@
 try:
     import redis
 
-    if redis.VERSION < (3, 0, 0):
+    if ((redis.VERSION >= (2, 10, 6)) and (redis.VERSION < (3, 0, 0))):
 
         @wrapt.patch_function_wrapper('redis.client','StrictRedis.execute_command')
         def execute_command_with_instana(wrapped, instance, args, kwargs):
@@ -76,6 +76,7 @@ def execute_with_instana(wrapped, instance, args, kwargs):
 
         logger.debug("Instrumenting redis")
     else:
-        logger.debug("redis >=3.0.0 not supported (yet)")
+        logger.debug("redis <= 2.10.5 >=3.0.0 not supported.")
+        logger.debug("  --> https://docs.instana.io/ecosystem/python/supported-versions/#tracing")
 except ImportError:
     pass

From 647e906a5d62e2dbdee87e0e648556c4a984cae2 Mon Sep 17 00:00:00 2001
From: Peter Giacomo Lombardo <pglombardo@gmail.com>
Date: Tue, 25 Jun 2019 00:08:22 +0200
Subject: [PATCH 2/3] Make sure not to send empty trace payloads

---
 instana/agent.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/instana/agent.py b/instana/agent.py
index 676b8e59..3121dc7f 100644
--- a/instana/agent.py
+++ b/instana/agent.py
@@ -214,6 +214,9 @@ def report_traces(self, spans):
         Used to report entity data (metrics & snapshot) to the host agent.
         """
         try:
+            if len(spans) == 0:
+                return 0
+
             response = None
             response = self.client.post(self.__traces_url(),
                                         data=self.to_json(spans),

From ee0e7843fc3f5a57eef81107b2250e0018e398ee Mon Sep 17 00:00:00 2001
From: Peter Giacomo Lombardo <pglombardo@gmail.com>
Date: Tue, 25 Jun 2019 10:48:34 +0200
Subject: [PATCH 3/3] Code comment

---
 instana/agent.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/instana/agent.py b/instana/agent.py
index 3121dc7f..1341baae 100644
--- a/instana/agent.py
+++ b/instana/agent.py
@@ -214,6 +214,8 @@ def report_traces(self, spans):
         Used to report entity data (metrics & snapshot) to the host agent.
         """
         try:
+            # Concurrency double check:  Don't report if we don't have
+            # any spans
             if len(spans) == 0:
                 return 0