fixing quoteservice metrics exporting (open-telemetry#793)

* fixing quoteservice metrics exporting
metrics exporting was quietly failing due to misconfiguration. Update some packages
to pick up the relevant bugfix, and use OTEL_EXPORTER_OTLP_ENDPOINT so that metrics,
traces and eventually logs can use it.
In passing, enable some logging which makes future errors more obvious.

* changelog

* Update CHANGELOG.md

Co-authored-by: Juliano Costa <julianocosta89@outlook.com>

* fixing changelog link

* update to latest api with warning fixed

---------

Co-authored-by: Juliano Costa <julianocosta89@outlook.com>

CHANGELOG.md

@@ -273,3 +273,5 @@ significant modifications will be credited to OpenTelemetry Authors.
   ([#764](https://github.com/open-telemetry/opentelemetry-demo/pull/764))
 * [chore] align memory limits with Helm chart
   ([#781](https://github.com/open-telemetry/opentelemetry-demo/pull/781))
+* [bug] fixing quoteservice metrics exporting (PHP)
+  ([#793](https://github.com/open-telemetry/opentelemetry-demo/pull/793))

docker-compose.yml

@@ -455,7 +455,7 @@ services:
     ports:
       - "${QUOTE_SERVICE_PORT}"
     environment:
-      - OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=http://${OTEL_COLLECTOR_HOST}:4318/v1/traces
+      - OTEL_EXPORTER_OTLP_ENDPOINT=http://${OTEL_COLLECTOR_HOST}:4318
       - OTEL_PHP_AUTOLOAD_ENABLED=true
       - QUOTE_SERVICE_PORT
       - OTEL_RESOURCE_ATTRIBUTES

src/quoteservice/composer.json

@@ -7,8 +7,9 @@
         "php": ">= 8.2",
         "ext-json": "*",
         "monolog/monolog": "2.8.0",
-        "open-telemetry/sdk": "1.0.0beta1",
-        "open-telemetry/exporter-otlp": "1.0.0beta1",
+        "open-telemetry/api": "1.0.0beta4",
+        "open-telemetry/sdk": "1.0.0beta3",
+        "open-telemetry/exporter-otlp": "1.0.0beta3",
         "open-telemetry/opentelemetry-auto-slim": "1.0.0beta4",
         "guzzlehttp/guzzle": "7.4.5",
         "php-di/php-di": "6.4.0",
@@ -21,5 +22,10 @@
         "psr-4": {
             "App\\": "src/"
         }
+    },
+    "config": {
+        "allow-plugins": {
+            "php-http/discovery": false
+        }
     }
 }

src/quoteservice/public/index.php

@@ -17,10 +17,18 @@
 
 use DI\Bridge\Slim\Bridge;
 use DI\ContainerBuilder;
+use Monolog\Handler\StreamHandler;
+use Monolog\Logger;
+use OpenTelemetry\API\Common\Log\LoggerHolder;
+use Psr\Log\LogLevel;
 use Slim\Factory\AppFactory;
 
 require __DIR__ . '/../vendor/autoload.php';
 
+LoggerHolder::set(
+    new Logger('otel-php', [new StreamHandler('php://stdout', LogLevel::DEBUG)])
+);
+
 // Instantiate PHP-DI ContainerBuilder
 $containerBuilder = new ContainerBuilder();