OpenTelemetry for Shopware 6

Requirements

• ext-opentelemetry PHP extension
• Optional: ext-grpc when using the gRPC exporter

Installation

composer require shopware/opentelemetry

Configuration

Enable open telemetry with the following environment variables:

OTEL_PHP_AUTOLOAD_ENABLED=true
OTEL_SERVICE_NAME=shopware # or any other name

This extension can be disabled via:

OTEL_PHP_DISABLED_INSTRUMENTATIONS=shopware

You will need to configure the exporter to send the data to a collector.

Here is an example with OTLP over gRPC:

OTEL_TRACES_EXPORTER=otlp
OTEL_EXPORTER_OTLP_PROTOCOL=grpc
OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4317

You will need to install also composer packages: open-telemetry/transport-grpc and open-telemetry/exporter-otlp.

Enabling Shopware custom tracing

To enable tracing for Shopware, you need to add the following config:

# config/packages/opentelemetry.yaml

shopware:
    profiler:
        integrations:
            - OpenTelemetry

Adding custom spans

This spans are working with all profilers (Symfony Profiler bar, Tideways, ...) and are not exclusive to OpenTelemetry.

use Shopware\Core\Profiling\Profiler;

$value = Profiler::trace('<name>', function () {
    return $myFunction();
});

Forward logs to OpenTelemetry

You can forward logs to OpenTelemetry with the following configuration:

# config/packages/opentelemetry.yaml

monolog:
    handlers:
        main:
            type: service
            id: monolog.handler.open_telemetry
        elasticsearch:
            type: service
            id: monolog.handler.open_telemetry

Transport metrics to OpenTelemetry

You can enable OpenTelemetry metrics transport with the following configuration:

# config/packages/opentelemetry.yaml
open_telemetry_shopware:
  metrics:
    enabled: true
    namespace: 'io.opentelemetry.contrib.php.shopware' # or your custom namespace

Please note that OpenTelemetry SDK has to be configured to send metrics to the collector. It is configured using the same environment variables. Example configuration could look like this:

OTEL_SERVICE_NAME=shopware
OTEL_PHP_AUTOLOAD_ENABLED=true
OTEL_METRICS_EXPORTER=otlp
OTEL_EXPORTER_OTLP_PROTOCOL=grpc
OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4317
OTEL_EXPORTER_OTLP_METRICS_TEMPORALITY_PREFERENCE=delta

Temporality configuration

OpenTelemetry PHP SDK does not support storage for accumulation of metrics. As PHP processes are short-lived, it's best to emit metrics with delta temporality and aggregate them on receiving side. Unfortunately at the moment of writing this OpenTelemetry Collector does not support transforming delta temporality metrics to cumulative. The feature is in the development, the progress can be tracked here.

Meanwhile the issue can be handled either by implementing aggregation manually or use metrics backend that can work with delta temporality. We've successfully tested this with DataDog.

Some links:

• OpenTelemetry Metrics Data Model
• Temporality easily explained