From 96aeaee5b7cb8c0bc4af7ff4717b429f2d9f67e1 Mon Sep 17 00:00:00 2001
From: Brett McBride <brett.a.mcbride@gmail.com>
Date: Fri, 10 Jan 2025 10:17:14 +1100
Subject: [PATCH] declarative config 0.3+ support (#1452)

This brings declarative config support up to 0.3 plus some of the unreleased 0.4 features:

* porting code from Nevay/otel-sdk-configuration
* support 0.4 metric reader config
* allow empty keys
since https://github.com/open-telemetry/opentelemetry-specification/pull/4269 empty keys are allows, and NULL is no longer equivalent to unset
* update config example to remove empty objects
* remove moved component providers from composer.json
* add ComponentProviderRegistry::componentMap for instrumentation configuration
---
 Metrics/Stream/DeltaStorage.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Metrics/Stream/DeltaStorage.php b/Metrics/Stream/DeltaStorage.php
index 066d2d9..52c987c 100644
--- a/Metrics/Stream/DeltaStorage.php
+++ b/Metrics/Stream/DeltaStorage.php
@@ -14,7 +14,7 @@
  */
 final class DeltaStorage
 {
-    private Delta $head;
+    private readonly Delta $head;
 
     public function __construct(private readonly AggregationInterface $aggregation)
     {