From 596fcbc2cbc53d6b31d1126e11a13c1a9ee36c0b Mon Sep 17 00:00:00 2001
From: Bryan Naegele <bryannaegele@users.noreply.github.com>
Date: Tue, 12 Sep 2023 19:28:53 -0600
Subject: [PATCH] Handle empty stack (#205)

* Update otel_telemetry.erl

* Add debug log (#204)
---
 utilities/opentelemetry_telemetry/src/otel_telemetry.erl | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/utilities/opentelemetry_telemetry/src/otel_telemetry.erl b/utilities/opentelemetry_telemetry/src/otel_telemetry.erl
index 16dff82..9c1beee 100644
--- a/utilities/opentelemetry_telemetry/src/otel_telemetry.erl
+++ b/utilities/opentelemetry_telemetry/src/otel_telemetry.erl
@@ -100,7 +100,11 @@ peek_from_tracer_stack(TracerId) ->
         undefined ->
             undefined;
         [SpanCtxSet | _Rest] ->
-            SpanCtxSet
+            SpanCtxSet;
+        [] ->
+            ?LOG_DEBUG("`opentelemetry_telemetry` span ctx tracer stack for "
+                       "TracerId ~p in Pid ~p is empty.", [TracerId, self()]),
+            undefined
     end.
 
 -spec pop_ctx(atom(), telemetry:event_metadata()) -> ctx_set().