code: @DELETE
  	@Produces(MediaType.APPLICATION_JSON)
  	@Path("/{alertId}/notifications")
  	@Description("Deletes all notifications for the given alert ID. Associated triggers are not deleted from the alert.")
  	public Response deleteAllNotificationsByAlertId(@Context HttpServletRequest req,
  			@PathParam("alertId") BigInteger alertId) {
  		if (alertId == null || alertId.compareTo(BigInteger.ZERO) < 1) {
  			throw new WebApplicationException("Alert Id cannot be null and must be a positive non-zero number.", Status.BAD_REQUEST);
  		}
  
  		Alert alert = alertService.findAlertByPrimaryKey(alertId);
  
  		if (alert != null) {
  			validateResourceAuthorization(req, alert.getOwner(), getRemoteUser(req));
  			alert.setNotifications(new ArrayList<Notification>(0));
  			alert.setModifiedBy(getRemoteUser(req));
  			alertService.updateAlert(alert);
  			return Response.status(Status.OK).build();
  		}
  		throw new WebApplicationException(Response.Status.NOT_FOUND.getReasonPhrase(), Response.Status.NOT_FOUND);
  	}
docs: Deletes all notifications for a given alert.
  
  @param   req      The HttpServlet request object. Cannot be null.
  @param   alertId  The alert id. Cannot be null and must be a positive non-zero number.
  
  @return  Updated alert object.
  
  @throws  WebApplicationException  The exception with 404 status will be thrown if an alert does not exist.