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+<?php
+
+declare(strict_types=1);
+
+namespace OpenTelemetry\SDK\Common\Configuration;
+
+/**
+ * Default values for environment variables defined by the OpenTelemetry specification and language specific variables for the PHP SDK.
+ * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md
+ */
+interface Defaults
+{
+ /**
+ * General SDK Configuration
+ * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#general-sdk-configuration
+ */
+ public const OTEL_LOG_LEVEL = 'info';
+ public const OTEL_PROPAGATORS = 'tracecontext,baggage';
+ public const OTEL_TRACES_SAMPLER = 'parentbased_always_on';
+ public const OTEL_SDK_DISABLED = 'false';
+ /**
+ * Batch Span Processor
+ * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#batch-span-processor
+ */
+ public const OTEL_BSP_SCHEDULE_DELAY = 5000;
+ public const OTEL_BSP_EXPORT_TIMEOUT = 30000;
+ public const OTEL_BSP_MAX_QUEUE_SIZE = 2048;
+ public const OTEL_BSP_MAX_EXPORT_BATCH_SIZE = 512;
+ /**
+ * Batch LogRecord Processor
+ * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#batch-logrecord-processor
+ */
+ public const OTEL_BLRP_SCHEDULE_DELAY = 1000;
+ public const OTEL_BLRP_EXPORT_TIMEOUT = 30000;
+ public const OTEL_BLRP_MAX_QUEUE_SIZE = 2048;
+ public const OTEL_BLRP_MAX_EXPORT_BATCH_SIZE = 512;
+ /**
+ * Attribute Limits
+ * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#attribute-limits
+ */
+ public const OTEL_ATTRIBUTE_COUNT_LIMIT = 128;
+ public const OTEL_ATTRIBUTE_VALUE_LENGTH_LIMIT = PHP_INT_MAX;
+ /**
+ * Span Limits
+ * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#span-limits
+ */
+ public const OTEL_SPAN_ATTRIBUTE_COUNT_LIMIT = 128;
+ public const OTEL_SPAN_EVENT_COUNT_LIMIT = 128;
+ public const OTEL_SPAN_LINK_COUNT_LIMIT = 128;
+ public const OTEL_EVENT_ATTRIBUTE_COUNT_LIMIT = 128;
+ public const OTEL_LINK_ATTRIBUTE_COUNT_LIMIT = 128;
+ /**
+ * LogRecord Limits
+ * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#logrecord-limits
+ */
+ public const OTEL_LOGRECORD_ATTRIBUTE_VALUE_LENGTH_LIMIT = PHP_INT_MAX;
+ public const OTEL_LOGRECORD_ATTRIBUTE_COUNT_LIMIT = 128;
+ /**
+ * OTLP Exporter
+ * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md#configuration-options
+ */
+ // Endpoint
+ public const OTEL_EXPORTER_OTLP_ENDPOINT = 'http://localhost:4318';
+ public const OTEL_EXPORTER_OTLP_TRACES_ENDPOINT = 'http://localhost:4318';
+ public const OTEL_EXPORTER_OTLP_METRICS_ENDPOINT = 'http://localhost:4318';
+ public const OTEL_EXPORTER_OTLP_LOGS_ENDPOINT = 'http://localhost:4318';
+ // Insecure
+ public const OTEL_EXPORTER_OTLP_INSECURE = 'false';
+ public const OTEL_EXPORTER_OTLP_TRACES_INSECURE = 'false';
+ public const OTEL_EXPORTER_OTLP_METRICS_INSECURE = 'false';
+ public const OTEL_EXPORTER_OTLP_LOGS_INSECURE = 'false';
+ // Timeout (seconds)
+ public const OTEL_EXPORTER_OTLP_TIMEOUT = 10;
+ public const OTEL_EXPORTER_OTLP_TRACES_TIMEOUT = 10;
+ public const OTEL_EXPORTER_OTLP_METRICS_TIMEOUT = 10;
+ public const OTEL_EXPORTER_OTLP_LOGS_TIMEOUT = 10;
+ // Protocol
+ public const OTEL_EXPORTER_OTLP_PROTOCOL = 'http/protobuf';
+ public const OTEL_EXPORTER_OTLP_TRACES_PROTOCOL = 'http/protobuf';
+ public const OTEL_EXPORTER_OTLP_METRICS_PROTOCOL = 'http/protobuf';
+ public const OTEL_EXPORTER_OTLP_LOGS_PROTOCOL = 'http/protobuf';
+ /**
+ * Zipkin Exporter
+ * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#zipkin-exporter
+ */
+ public const OTEL_EXPORTER_ZIPKIN_ENDPOINT = 'http://localhost:9411/api/v2/spans';
+ // Timeout (seconds)
+ public const OTEL_EXPORTER_ZIPKIN_TIMEOUT = 10;
+ /**
+ * Prometheus Exporter
+ * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#prometheus-exporter
+ */
+ public const OTEL_EXPORTER_PROMETHEUS_HOST = '0.0.0.0';
+ public const OTEL_EXPORTER_PROMETHEUS_PORT = 9464;
+ /**
+ * Exporter Selection
+ * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#exporter-selection
+ */
+ public const OTEL_TRACES_EXPORTER = 'otlp';
+ public const OTEL_METRICS_EXPORTER = 'otlp';
+ public const OTEL_LOGS_EXPORTER = 'otlp';
+ /**
+ * Metrics SDK Configuration
+ * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#metrics-sdk-configuration
+ */
+ public const OTEL_METRICS_EXEMPLAR_FILTER = 'with_sampled_trace';
+ public const OTEL_METRIC_EXPORT_INTERVAL = 60000;
+ public const OTEL_METRIC_EXPORT_TIMEOUT = 30000;
+ public const OTEL_EXPORTER_OTLP_METRICS_TEMPORALITY_PREFERENCE = 'cumulative';
+ public const OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION = 'explicit_bucket_histogram';
+ /**
+ * Language Specific Environment Variables
+ * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#language-specific-environment-variables
+ */
+ public const OTEL_PHP_TRACES_PROCESSOR = 'batch';
+ public const OTEL_PHP_DETECTORS = 'all';
+ public const OTEL_PHP_AUTOLOAD_ENABLED = 'false';
+ public const OTEL_PHP_INTERNAL_METRICS_ENABLED = 'false';
+ public const OTEL_PHP_DISABLED_INSTRUMENTATIONS = [];
+ public const OTEL_PHP_LOGS_PROCESSOR = 'batch';
+ public const OTEL_PHP_LOG_DESTINATION = 'default';
+}