fun Application.restService(
    connector: Connector,
    synchronizer: SynchronizationManager,
    logger: Logger
) {
    install(ContentNegotiation) {
        gson {
            setDateFormat(DateFormat.LONG)
            setPrettyPrinting()
        }
    }
    install(DefaultHeaders)
    install(CallLogging)

    val prometheusRegistry = PrometheusMeterRegistry(PrometheusConfig.DEFAULT)
    install(MicrometerMetrics) {
        registry = prometheusRegistry
    }

    install(Routing) {
        get("/metrics") {
            call.respond(prometheusRegistry.scrape())
        }
        route("/synchronize") {
            synchronizationRest(connector, synchronizer, logger)
        }
    }
}

fun Route.synchronizationRest(connector: Connector, synchronizer: SynchronizationManager, logger: Logger) {

    route("/item") {

        post("/") {
            try {
                ...handling is done here, likely irrelevant, as this is never reached when using Ktor 1.6.8...
                }
            } catch (e: Exception) {
                return@post call.respond(HttpStatusCode.BadRequest, e.localizedMessage)
            }
        }
    }
... other routes
}