extensions/typescript-language-features/src/utils/tracer.ts/Tracer/traceRequest
class Tracer:	public traceRequest(serverId: string, request: Proto.Request, responseExpected: boolean, queueLength: number): void {
		if (this.trace === Trace.Off) {
			return;
		}
		let data: string | undefined = undefined;
		if (this.trace === Trace.Verbose && request.arguments) {
			data = `Arguments: ${JSON.stringify(request.arguments, null, 4)}`;
		}
		this.logTrace(serverId, `Sending request: ${request.command} (${request.seq}). Response expected: ${responseExpected ? 'yes' : 'no'}. Current queue length: ${queueLength}`, data);
	}