From 5d6482e35b43bbfb4ffc6a29cc5d034745669664 Mon Sep 17 00:00:00 2001
From: Mikael <intemicke@gmail.com>
Date: Mon, 18 Mar 2024 16:46:05 +0100
Subject: [PATCH] fix: erlang & elixir sampler

---
 content/en/docs/languages/erlang/sampling.md | 30 +++++++++++---------
 1 file changed, 17 insertions(+), 13 deletions(-)

diff --git a/content/en/docs/languages/erlang/sampling.md b/content/en/docs/languages/erlang/sampling.md
index f7e6afe6ffd0..5547ff179092 100644
--- a/content/en/docs/languages/erlang/sampling.md
+++ b/content/en/docs/languages/erlang/sampling.md
@@ -159,12 +159,16 @@ description(_) ->
     <<"AttributeSampler">>.
 
 should_sample(_Ctx, _TraceId, _Links, _SpanName, _SpanKind, Attributes, ConfigAttributes) ->
-    case maps:intersect(Attributes, ConfigAttributes) of
-        Map when map_size(Map) > 0 ->
-            {?DROP, [], []};
-        _ ->
-            {?RECORD_AND_SAMPLE, [], []}
-    end.
+  case maps:intersect(Attributes, ConfigAttributes) of
+    Intersection when map_size(Intersection) > 0 ->
+      Keys = maps:keys(Intersection),
+      ConfAttrPairs = [{maps:get(Key, Attr), maps:get(Key, Conf)} || Key <- Keys],
+      case lists:any(fun({A, B}) -> A == B end, ConfAttrPairs) of
+        true -> {?DROP, [], []};
+        _ -> {?RECORD_AND_SAMPLE, [], []}
+      end;
+    _ -> {?RECORD_AND_SAMPLE, [], []}
+  end
 ```
 
 {{% /tab %}} {{% tab Elixir %}}
@@ -184,13 +188,13 @@ defmodule AttributesSampler do
   end
 
   def should_sample(_ctx, _trace_id, _links, _span_name, _span_kind, attributes, config_attributes) do
-    case :maps.intersect(attributes, config_attributes) do
-      map when map_size(map) > 0 ->
-        {:drop, [], []}
-      _ ->
-        {:record_and_sample, [], []}
-    end
-  end
+    attr_match =
+      Map.intersect(attributes, config_attributes)
+      |> Map.keys()
+      |> Enum.map(fn key -> {Map.get(attributes, key), Map.get(config_attributes, key)} end)
+      |> Enum.any?(fn {attr, conf} -> attr == conf end)
+
+    if attr_match, do: {:drop, [], []}, else: {:record_and_sample, [], []}
 end
 ```