From 4659839201854a52564fee05445f5b5f1a6ba65c Mon Sep 17 00:00:00 2001
From: Bryan Boreham <bjboreham@gmail.com>
Date: Tue, 8 Jan 2019 11:06:12 +0000
Subject: [PATCH] Dont flag context.Canceled as an error in tracing

Cancellations are always caused by something else, so having them show
up as errors in the tracing UI is distracting.
---
 instrument/instrument.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/instrument/instrument.go b/instrument/instrument.go
index 2994544c..2b6168d4 100644
--- a/instrument/instrument.go
+++ b/instrument/instrument.go
@@ -152,7 +152,9 @@ func CollectedRequest(ctx context.Context, method string, col Collector, toStatu
 	col.After(method, toStatusCode(err), start)
 
 	if err != nil {
-		ext.Error.Set(sp, true)
+		if err != context.Canceled {
+			ext.Error.Set(sp, true)
+		}
 		sp.LogFields(otlog.Error(err))
 	}
 	sp.Finish()