make jaeger service name configurable

classes/config.php

@@ -195,6 +195,9 @@ class Config {
 	/** host running Jaeger collector to receive traces (disabled if empty) */
 	const JAEGER_REPORTING_HOST = "JAEGER_REPORTING_HOST";
 
+	/** Jaeger service name */
+	const JAEGER_SERVICE_NAME = "tt-rss";
+
 	/** default values for all global configuration options */
 	private const _DEFAULTS = [
 		Config::DB_TYPE => [ "pgsql", 									Config::T_STRING ],
@@ -253,6 +256,7 @@ class Config {
 																					Config::T_STRING ],
 		Config::HTTP_429_THROTTLE_INTERVAL => [ 3600,				Config::T_INT ],
 		Config::JAEGER_REPORTING_HOST => [ "",							Config::T_STRING ],
+		Config::JAEGER_SERVICE_NAME => [ "tt-rss",					Config::T_STRING ],
 	];
 
 	/** @var Config|null */

classes/tracer.php

@@ -23,7 +23,7 @@ class Tracer {
 					],
 					'dispatch_mode' => \Jaeger\Config::JAEGER_OVER_BINARY_UDP,
 				],
-				'tt-rss'
+				Config::get(Config::JAEGER_SERVICE_NAME)
 			);
 
 			$config->initializeTracer();