private RestApiException restApiExceptionFromTimeout(String operationDescription,
                                                                HostName hostName,
                                                                UncheckedTimeoutException e) {
        // Return timeouts as 409 Conflict instead of 504 Gateway Timeout to reduce noise in 5xx graphs.
        return createRestApiException(operationDescription, hostName, e,
                HostedVespaPolicy.DEADLINE_CONSTRAINT, e.getMessage(), Response.Status.CONFLICT);
    }
Resume normal operations for all services on a host that has previously been allowed suspension.

If the host is already registered as running normal operations, then resume() is idempotent
and will succeed.
orchestrator/src/main/java/com/yahoo/vespa/orchestrator/resources/HostRequestHandler.java