module service-statistics {

    yang-version 1;

    namespace
      "urn:cisco:params:xml:ns:yang:sfc-ss";

    prefix sfc-ss;

    import ietf-yang-types {
      prefix yang;
      revision-date "2013-07-15";
    }

    organization "Cisco Systems, Inc.";

    contact
      "Reinaldo Penno <repenno@cisco.com>";

    description
      "This module contains a collection of YANG definitions for
     managing service statistics. Service statistics are used
     to determine the load and efficiency of a service function
     or service function forwarder device

     Copyright (c) 2013 IETF Trust and the persons identified as
     authors of the code.  All rights reserved.

     Redistribution and use in source and binary forms, with or
     without modification, is permitted pursuant to, and subject
     to the license terms contained in, the Simplified BSD License
     set forth in Section 4.c of the IETF Trust's Legal Provisions
     Relating to IETF Documents
     (http://trustee.ietf.org/license-info).

     This version of this YANG module is part of RFC XXXX; see
     the RFC itself for full legal notices.";

    revision "2014-07-01" {
      description "Initial Revision";
      reference
        "https://tools.ietf.org/html/draft-penno-sfc-yang";

    }


    grouping service-statistics-group {
      description
        "Group that holds the list that indexes statistics by timestamp";
      list statistic-by-timestamp {
        key "timestamp";
        description
          "This list holds statistics indexed by timestamp";
        leaf timestamp {
          type uint64;
          description
            "Date and time of record creation in milliseconds
                  counting from 1.1.1970 00:00:00 UTC (= 0)";
        }

        uses statistic-fields;
      }  // list statistic-by-timestamp
    }  // grouping service-statistics-group

    grouping statistic-fields {
      description
        "Groups all statistics containers";
      container service-statistic {
        config false;
        description
          "This container holds packets and bytes statistics";
        leaf bytes-in {
          type yang:zero-based-counter64;
          description "Received bytes";
        }

        leaf bytes-out {
          type yang:zero-based-counter64;
          description "Transmitted bytes";
        }

        leaf packets-in {
          type yang:zero-based-counter64;
          description "Received packets";
        }

        leaf packets-out {
          type yang:zero-based-counter64;
          description "Transmitted packets";
        }
      }  // container service-statistic
    }  // grouping statistic-fields
  }  // module service-statistics