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-rw-r--r--kamon-core/src/main/resources/reference.conf2
1 files changed, 2 insertions, 0 deletions
diff --git a/kamon-core/src/main/resources/reference.conf b/kamon-core/src/main/resources/reference.conf
index e140db83..a779ad02 100644
--- a/kamon-core/src/main/resources/reference.conf
+++ b/kamon-core/src/main/resources/reference.conf
@@ -149,6 +149,8 @@ kamon {
# Size of the encoding buffer for the Binary Codec.
binary-buffer-size = 256
+ string-keys = [ ]
+
# Codecs to be used when propagating a Context through a HTTP Headers transport.
http-headers-keys {
span = "kamon.trace.SpanCodec$B3"