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+<?php
+
+namespace Jaeger;
+
+// Max number of bits to use when generating random ID
+const MAX_ID_BITS = 64;
+
+// How often remotely controller sampler polls for sampling strategy
+const DEFAULT_SAMPLING_INTERVAL = 60;
+
+// How often remote reporter does a preemptive flush of its buffers
+const DEFAULT_FLUSH_INTERVAL = 1;
+
+// Name of the HTTP header used to encode trace ID
+const TRACE_ID_HEADER = 'uber-trace-id';
+
+// Prefix for HTTP headers used to record baggage items
+const BAGGAGE_HEADER_PREFIX = 'uberctx-';
+
+// The name of HTTP header or a TextMap carrier key which, if found in the
+// carrier, forces the trace to be sampled as "debug" trace. The value of the
+// header is recorded as the tag on the # root span, so that the trace can
+// be found in the UI using this value as a correlation ID.
+const DEBUG_ID_HEADER_KEY = 'jaeger-debug-id';
+
+const JAEGER_CLIENT_VERSION = 'PHP-' . PHP_VERSION;
+
+// Tracer-scoped tag that tells the version of Jaeger client library
+const JAEGER_VERSION_TAG_KEY = 'jaeger.version';
+
+// Tracer-scoped tag that contains the hostname
+const JAEGER_HOSTNAME_TAG_KEY = 'jaeger.hostname';
+
+const SAMPLER_TYPE_TAG_KEY = 'sampler.type';
+
+const SAMPLER_PARAM_TAG_KEY = 'sampler.param';
+
+const DEFAULT_SAMPLING_PROBABILITY = 0.001;
+
+const DEFAULT_LOWER_BOUND = 1.0 / (10.0 * 60.0); # sample once every 10 minutes
+
+const DEFAULT_MAX_OPERATIONS = 2000;
+
+const STRATEGIES_STR = 'perOperationStrategies';
+
+const OPERATION_STR = 'operation';
+
+const DEFAULT_LOWER_BOUND_STR = 'defaultLowerBoundTracesPerSecond';
+
+const PROBABILISTIC_SAMPLING_STR = 'probabilisticSampling';
+
+const SAMPLING_RATE_STR = 'samplingRate';
+
+const DEFAULT_SAMPLING_PROBABILITY_STR = 'defaultSamplingProbability';
+
+const OPERATION_SAMPLING_STR = 'operationSampling';
+
+const MAX_TRACES_PER_SECOND_STR = 'maxTracesPerSecond';
+
+const RATE_LIMITING_SAMPLING_STR = 'rateLimitingSampling';
+
+const STRATEGY_TYPE_STR = 'strategyType';
+
+// the type of sampler that always makes the same decision.
+const SAMPLER_TYPE_CONST = 'const';
+
+// the type of sampler that polls Jaeger agent for sampling strategy.
+const SAMPLER_TYPE_REMOTE = 'remote';
+
+// the type of sampler that samples traces with a certain fixed probability.
+const SAMPLER_TYPE_PROBABILISTIC = 'probabilistic';
+
+// the type of sampler that samples only up to a fixed number
+// of traces per second.
+// noinspection SpellCheckingInspection
+const SAMPLER_TYPE_RATE_LIMITING = 'ratelimiting';
+
+// the type of sampler that samples only up to a fixed number
+// of traces per second.
+// noinspection SpellCheckingInspection
+const SAMPLER_TYPE_LOWER_BOUND = 'lowerbound';
+
+const DEFAULT_REPORTING_HOST = 'localhost';
+
+/** @deprecated */
+const DEFAULT_REPORTING_PORT = 5775;
+
+const DEFAULT_ZIPKIN_UDP_COMPACT_REPORTING_PORT = 5775;
+const DEFAULT_JAEGER_UDP_BINARY_REPORTING_PORT = 6832;
+const DEFAULT_JAEGER_HTTP_BINARY_REPORTING_PORT = 14268;
+
+const DEFAULT_SAMPLING_PORT = 5778;
+
+const LOCAL_AGENT_DEFAULT_ENABLED = true;
+
+const ZIPKIN_SPAN_FORMAT = 'zipkin-span-format';
+
+const SAMPLED_FLAG = 0x01;
+
+const DEBUG_FLAG = 0x02;