iAgree Specification

---

Introduction

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.

Revision History

Versions tagged with R are inteded for research purpouses. Other versions are operational versions used in real projects.

Version	Date	Notes
1.0R	2013	Initial WS-Agreement derived DSL.
2.0	2016	Move to a new YAML independent syntax.
3.0	2016	Changes for interoperabilty with Governify Registry.
4.0R	2017	Extensions for SLA4OAI.
5.0	2017	Improved computers section.
5.1	2019	Collector and metrics improvements
5.2	2021	Customizable Window period
6.0R	2020	Changing focus from SLA-based to Customer-Agreement-based.

Version 5.2

Introduction

iAgree is an open source standard for describing Service Level Agreements (SLAs).

This SLA definition in a neutral vendor flavor will allow to foster innovation in the area. By this way, management tools can import and measure metrics and build SLAs for composed services in a standard approach.

Specification

An iAgree description is a JSON or a YAML document with following structure. Note that primitive data types in the iAgree specification are based on the types supported by the JSON-Schema Draft 4.

SLA Object

Each iAgree document must contain the following sections:

Field name	Field type	Required/Optional	Description
id	String	Required	document unique identification
version	String	Required	document version
type	String	Required	document type based on the SLA lifecycle
context	ContextObject	Required	holds the main information of the SLA context
terms	TermsObject	Required	holds the main information of the SLA terms

Example

Synthetic

id: MyServiceAgreement
version: 1.0.0
type: agreement
context:  ContextObject
terms:  TermsObject

ContextObject

Holds the main information of the SLA context.

Field name	Field type	Required/Optional	Description
iAgree	String	Required	iAgree specification version
provider	String	Optional	data about the owner/host of the service
consumer	String	Optional	data about the entity that consumes the service.
validity	ValidityObject	Optional	holds the main information of the SLA validity
definitions	DefinitionsObject	Required	holds the main information of the SLA definitions
infrastructure	Object	Required	provides information about the tools used for SLA storage, calculation, governance, etc.

Example

Synthetic

context:
  iAgree: 2.0
  provider: ISA Research Group
  consumer: Acme
  validity: ValidityObject
  infrastructure:
    designer: 'http://designer.governify.io'
    portal: 'http://portal.governify.io'
    registry: 'http://registry.governify.io'
  definitions: DefinitionsObject

ValidityObject

Holds the main information of the SLA validity.

Field name	Field type	Required/Optional	Description
initial	String	Required	start date of the SLA according to ISO 8601 time format
timeZone	String	Required	time zone of the SLA according to ISO 8601 time zone format
end	String	Optional	end date of the SLA according to ISO 8601 time format

Example

Synthetic

validity:
    initial: '2014-10-16'
    timeZone: Europe/Madrid

DefinitionsObject

Holds the main information of the SLA definitions.

Field name	Field type	Required/Optional	Description
schemas	Array [Object]	Required	definition schemas
scopes	Array [Object]	Required	definition scopes

Example

Synthetic

definitions:
      schemas:
        myMetric:
            description: some gathered values
            type: double
            unit: '%'
      scopes:
          myGlobalScope:
            myScope:
              myPropertyName: myPropertyValue

SLA for API services

  definitions:
    schemas:
      animalTypes:
        type: integer
        format: int64
        description: Number of different animal types.
      resourceInstances:
        type: integer
        format: int64
        description: Number of pet resources
      requests:
        type: integer
        format: int64
        description: Number of requests
      responseTime:
        type: integer
        format: int64
        description: Time in ms spent by request

SLA for human services

  definitions:
    schemas:
      escalatedIncidentPercentage:
        description: Percentage of incidents escalated by first level support teams
        type: double
        unit: '%'
      resolutionTime:
        description: Immediate incident resolution by first level support teams
        type: string
        unit: hours
      schedule:
        description: service schedule
        type: string

TermsObject

Holds the main information of the SLA terms.

Field name	Field type	Required/Optional	Description
pricing	PricingObject	Required	Holds the main information of the SLA pricing.
metrics	MetricsObject	Required	Holds the main information of the SLA metric.
guarantees	Array[GuaranteeObject]	Required	Holds the main information of the SLA guarantees.
configurations	ConfigurationsObject	Optional	Holds the main information of the SLA configurations.
quotas	Array[QuotaObject]	Optional	Holds the main information of the SLA quotas.
rates	Array[RateObject]	Optional	Holds the main information of the SLA rates.

Example

Synthetic

terms:
  pricing: PricingObject
  metrics: MetricsObject
  guarantees: Array[GuaranteeObject]
  configurations: ConfigurationsObject
  quotas:  Array[QuotaObject]
  rates: Array[RateObject]

PricingObject

Holds the main information of the SLA pricing.

Field name	Field type	Required/Optional	Description
cost	Double	Optional	cost associated to this service.
currency	String	Optional	currency used to express the cost according to ISO 4217. Samples: USD, EUR, or BTC for US dollar, euro, or bitcoin, respectively.
billing	BillingObject	Required	holds the main information of the SLA billing.

Example

Synthetic

pricing:
    cost: 50.0
    currency: EUR
    billing: BillingObject

BillingObject

Holds the main information of the SLA billing.

Field name	Field type	Required/Optional	Description
period	String: ["onepay", "daily", "weekly", "monthly", "quarterly", "yearly"]	Required	period used for billing. Supported values are: onepay: unique payment before start using the service; daily: billing at the end of every day; weekly: billing at the end of every week; monthly: billing at the end of every month; quarterly: billing at the end of every quarter; yearly: billing at the end of every year
initial	String	Optional	start date of the billing cycle according to ISO 8601 time format
penalties	Array[CompensationObject]	Optional	holds the main information of the SLA billing penalties
rewards	Array[CompensationObject]	Optional	holds the main information of the SLA billing rewards

Example

Synthetic

billing:
      period: monthly

SLA for human services

billing:
  period: monthly
  initial: '2016-05-12T10:35:36.000'
  penalties:
    - over:
        escalatedIncidentPercentage:
          $ref: '#/context/definitions/schemas/escalatedIncidentPercentage'
      aggregatedBy: sum
      groupBy:
        serviceLine:
          $ref: '#/context/definitions/scopes/serviceDesk/serviceLine'
        activity:
          $ref: '#/context/definitions/scopes/serviceDesk/activity'
      upTo: -10

MetricsObject

Holds the main information of the SLA metrics.

Field name	Field type	Required/Optional	Description
{{metridId}}	MetricObject	Required	holds the main information of a SLA single metric

Example

Synthetic

metrics:
    myMetric1: MetricObject
    myMetric2: MetricObject
    myMetric3: MetricObject

SLA for API services

metrics:
    requests: MetricObject
    resourceInstances: MetricObject
    animalTypes: MetricObject

SLA for human services

metrics:
    issue_start: MetricObject
    issue_end: MetricObject
    issue_duration: MetricObject

MetricObject

Holds the main information of a SLA single metric.

Field name	Field type	Required/Optional	Description
schema	Object	Required	metric schema
measure	Object	Required	metric measure
type	String	Required	metric type
scope	Object	Required	metric scope

Example

Synthetic

myMetric1:
  schema: 
        $ref: '#/context/definitions/schemas/myMetric'
  type: consumption
  scope:
    myScope:
        $ref: '#/context/definitions/scopes/myGlobalScope/myScope'

SLA for API services

requests:
  schema:
    $ref: '#/context/definitions/schemas/requests'
  type: consumption
  scope:
    resource:
      $ref: '#/context/definitions/scopes/api/resource'
    operation:
      $ref: '#/context/definitions/scopes/api/operation'
    level:
      $ref: '#/context/definitions/scopes/oai/level'
    account:
      $ref: '#/context/definitions/scopes/oai/account'
resourceInstances:
  schema:
    $ref: '#/context/definitions/schemas/resourceInstances'
  type: check
  scope:
    resource:
      $ref: '#/context/definitions/scopes/api/resource'
    operation:
      $ref: '#/context/definitions/scopes/api/operation'
    level:
      $ref: '#/context/definitions/scopes/oai/level'
    account:
      $ref: '#/context/definitions/scopes/oai/account'
animalTypes:
  schema:
    $ref: '#/context/definitions/schemas/animalTypes'
  type: check
  scope:
    resource:
      $ref: '#/context/definitions/scopes/api/resource'
    operation:
      $ref: '#/context/definitions/scopes/api/operation'
    level:
      $ref: '#/context/definitions/scopes/oai/level'
    account:
      $ref: '#/context/definitions/scopes/oai/account'

SLA for human services

issue_start:
  schema:
    description: incident start date
    type: string
  computer: 'http://ppinot.computer.papamoscas-company-devel.governify.io/api/v1/indicators/issue_start/'
issue_end:
  schema:
    description: incident end date
    type: string
  computer: 'http://ppinot.computer.papamoscas-company-devel.governify.io/api/v1/indicators/issue_end/'
issue_duration:
  schema:
    description: incident duration
    type: string
    unit: seconds
  computer: >-
    http://ppinot.computer.papamoscas-company-devel.governify.io/api/v1/indicators/issue_duration/

CompensationObject

Holds the main information of a SLA single compensation.

Field name	Field type	Required/Optional	Description
over	Object	Required	metrics involved in the compensation calculation process
of	Array[ScopedCompensationObject]	Optional	holds the main information of the SLA scoped compensations
aggegatedBy	String	Optional	compensation aggregation function
groupBy	Object	Optional	compensation aggrupation function
upTo	Double	Optional	compensation limit

Example

Synthetic

penalties:
    over:
      myMetric:
        $ref: '#/context/definitions/schemas/myMetric'
    of: ScopedCompensationObject
    aggregatedBy: sum
    groupBy:
      myScope:
        $ref: '#/context/definitions/scopes/myGlobalScope/myScope'
    upTo: -10

SLA for API services

penalties:
    - over:
        escalatedIncidentPercentage:
          $ref: '#/context/definitions/schemas/escalatedIncidentPercentage'
      of: ScopedCompensationObject

ScopedCompensationObject

Holds the main information of a SLA single scoped compensation.

Field name	Field type	Required/Optional	Description
value	String	Required	scoped compensation value
condition	String	Required	scoped compensation condition

Example

Synthetic

- value: '-2'
  condition: myMetric >= 90.00

SLA for human services

- value: '-1.5'
  condition: serviceDesk_KPI_03A > 99.98 && serviceDesk_KPI_03A <= 100.00

GuaranteeObject

Holds the main information of a SLA single guarantee.

Field name	Field type	Required/Optional	Description
id	String	Required	guarantee unique identification
description	String	Optional	guarantee description
scope	Object	Required	guarantee scope
of	Array[ScopedGuaranteObject]	Required	holds the main information of the SLA scoped guarantees

Example

Synthetic

guarantees:
    id: myGuarantee
    scope:
        myScope:
            $ref: '#/context/definitions/scopes/myGlobalScope/myScope'
    of:  Array[ScopedGuaranteObject]

SLA for API services

  guarantees:
    - id: guarantees_responseTime
      scope:
        plan:
          $ref: '#/context/definitions/scopes/offering/plan'
        resource:
          $ref: '#/context/definitions/scopes/api/resource'
        operation:
          $ref: '#/context/definitions/scopes/api/operation'
        level:
          $ref: '#/context/definitions/scopes/oai/level'
        account:
          $ref: '#/context/definitions/scopes/oai/account'
      of: Array[ScopedGuaranteObject]

SLA for human services

  guarantees:
    - id: serviceDesk_KPI_12A
          scope:
            priority:
              $ref: '#/context/definitions/scopes/serviceDesk/priority'
            node:
              $ref: '#/context/definitions/scopes/serviceDesk/node'
            serviceLine:
              $ref: '#/context/definitions/scopes/serviceDesk/serviceLine'
            activity:
              $ref: '#/context/definitions/scopes/serviceDesk/activity'
          of:
            Array[ScopedGuaranteObject]

ScopedGuaranteObject

Holds the main information of a SLA single scoped guarantee.

Field name	Field type	Required/Optional	Description
scope	Object	Required	scoped guarantee scope
objective	String	Required	guarantee objective
with	Object	Optional	definition of metrics referenced in scope attribute
window	WindowObject	Required	guarantee window
evidences	Array[Object]	Optional	guarantee evidences
penalties	Array[CompensationObject]	Optional	holds the main information of the SLA guarantee penalties
rewards	Array[CompensationObject]	Optional	holds the main information of the SLA guarantee rewards

Example

Synthetic

of
    - scope:
        myScope: P1
      objective: myMetric <= 1.00
      with:
        myMetric: {}
      window: WindowObject
      evidences:
        - myMetric_evidence:
            $ref: '#/terms/metrics/myMetric1_evidence'
      penalties: Array[CompensationObject]

SLA for API services

of:
    - scope:
        plan: '*'
        resource: '*'
        operation: '*'
        level: account
        account: '*'
      objective: responseTime <= 800
      window: WindowObject
    - scope:
        plan: pro
        resource: '*'
        operation: '*'
        level: account
        account: '*'
      objective: responseTime <= 250
      window: WindowObject

SLA for human services

- scope:
    priority: P1
    node: '*'
  objective: serviceDesk_KPI_12A >= 95.00
  with:
    serviceDesk_KPI_12A:
      resolutionTime: <= 2
      schedule: 'L-DT00:00-23:59'
  window: WindowObject
  evidences:
    - issue_start:
        $ref: '#/terms/metrics/issue_start'
    - issue_end:
        $ref: '#/terms/metrics/issue_end'
    - issue_duration:
        $ref: '#/terms/metrics/issue_duration'
  penalties: Array[CompensationObject]

WindowObject

Holds the main information of the SLA guarantee window.

Field name	Field type	Required/Optional	Description
initial	String	Optional	start date of the window according to ISO 8601 time
end	String	Optional	end date of the window according to ISO 8601 time
rules	String	Optional	rules of the window according to Rrule library following the iCalendar RFC specification, with a few important differences. Two rules must be defined, the first one for the start of the periods and the second one for the end, separated by "---"
type	String	Required	window type
period	String: ["hourly", "daily", "weekly", "monthly", "yearly", "customRules"]	Required	used period. Supported values are: hourly: at the end of every hour; daily: at the end of every day; weekly: at the end of every week; monthly: at the end of every month; yearly: at the end of every year; customRules: defined in 'rules' field

Example

Monthly period with an initial date of '2009-10-16'

window:
    initial: '2009-10-16'
    type: static
    period: 'monthly'

Custom period. The first rule is defined for the periods start every day at 10 o'clock and the second one is defined for the periods end every day at 22 o'clock.

window:
    type: static
    period: 'customRules'
    rules: 'DTSTART:20200101T000000Z\nRRULE:FREQ=DAILY;INTERVAL=1;BYHOUR=10---DTSTART:20200101T000000Z\nRRULE:FREQ=DAILY;INTERVAL=1;BYHOUR=22'

ConfigurationsObject

Holds the main information of the SLA configurations.

Field name	Field type	Required/Optional	Description
{{configurationId}}	ConfigurationObject	Required	holds the main information of the SLA configurations

Example

Synthetic

configurations:
    myConfiguration1: ConfigurationObject
    myConfiguration2: ConfigurationObject
    myConfiguration3: ConfigurationObject

SLA for API services

configurations:
    availability: ConfigurationObject

ConfigurationObject

Holds the main information of a SLA single configuration.

Field name	Field type	Required/Optional	Description
scope	Object	Required	configuration scope
of	Array[ScopedConfigurationObject]	Required	holds the main information of the SLA scoped configuration

Example

Synthetic

myConfiguration1:
  scope:
    myScope:
      $ref: '#/context/definitions/scopes/myGlobalScope/myScope'
  of: ScopedConfigurationObject

SLA for API services

availability: 
    scope:
        plan:
          $ref: '#/context/definitions/scopes/offering/plan'
      of: ScopedConfigurationObject

ScopedConfigurationObject

Holds the main information of a SLA singled scoped configuration.

Field name	Field type	Required/Optional	Description
scope	Object	Required	configuration scope
value	{String, Number, Boolean}	Required	configuration value

Example

Synthetic

of:
    - scope:
        myScope: '*'
    value: 'true'

SLA for API services

of:
    - scope:
        plan: '*'
      value: 'R/00:00:00Z/15:00:00Z'
    - scope:
        plan: pro
      value: 'R/00:00:00Z/23:59:59Z'

QuotaObject

Holds the main information of a SLA single quota.

Field name	Field type	Required/Optional	Description
id	String	Required	quota unique identification
scope	Object	Required	quota scope
over	Object	Required	metrics involved in the quota calculation process
of	Array[ScopedQuotaObject]	Required	holds the main information of the SLA scoped quotas.

Example

Synthetic

-   id: myQuota
    scope:
        myScope:
         $ref: '#/context/definitions/scopes/myGlobalScope/myScope'
    over:
        myMetric:
            $ref: '#/terms/metrics/myMetric1'
    of:  Array[ScopedQuotaObject]

SLA for API services

- id: quotas_requests
      scope:
        plan:
          $ref: '#/context/definitions/scopes/offering/plan'
        resource:
          $ref: '#/context/definitions/scopes/api/resource'
        operation:
          $ref: '#/context/definitions/scopes/api/operation'
        level:
          $ref: '#/context/definitions/scopes/oai/level'
        account:
          $ref: '#/context/definitions/scopes/oai/account'
      over:
        requests:
          $ref: '#/terms/metrics/requests'
      of: Array[ScopedQuotaObject]

ScopedQuotaObject

Holds the main information of a SLA single scoped rate.

Field name	Field type	Required/Optional	Description
scope	Object	Required	scoped quota scope
limits	Array[LimitObject]	Required	holds the main information of a SLA scoped quota limit

Example

Synthetic

-   scope:
        myScope:
            $ref: '#/context/definitions/scopes/myGlobalScope/myScope'
    limits: Array[LimitObject]  

SLA for API services

- scope:
    plan: '*'
    resource: /pets
    operation: get
    level: tenant
    account:
      $ref: '#/context/consumer'
    limits:
    - max: 40
      period: hourly
- scope:
    plan: pro
    resource: /pets
    operation: post
    level: account
    account: '*'
  limits:
    - max: 100
      period: minutely

LimitObject

Holds the main information of a SLA scoped quota/rate limit.

Field name	Field type	Required/Optional	Description
max	Number	Required	quota/rate maximum value
period	String: ["daily", "weekly", "monthly", "quarterly", "yearly"]	Optional	used period. Supported values are: daily: at the end of every day; weekly: at the end of every week; monthly: at the end of every month; quarterly: at the end of every quarter; yearly: at the end of every year

Example

Synthetic

limits:
    - max: 40
      period: hourly

RateObject

Holds the main information of a SLA single rate.

Field name	Field type	Required/Optional	Description
id	String	Required	rate unique identification
scope	Object	Required	rate scope
over	Object	Required	metrics involved in the rate calculation process
of	Array[ScopedRateObject]	Required	holds the main information of the SLA scoped rates.

Example

Synthetic

rates:
    - id: myRate
      scope:
        myScope:
            $ref: '#/context/definitions/scopes/myGlobalScope/myScope'
      over:
        myMetric:
          $ref: '#/terms/metrics/myMetric1'
      of: Array[ScopedRateObject]

SLA for API services

rates:
    - id: rates_requests
      scope:
        plan:
          $ref: '#/context/definitions/scopes/offering/plan'
        resource:
          $ref: '#/context/definitions/scopes/api/resource'
        operation:
          $ref: '#/context/definitions/scopes/api/operation'
        level:
          $ref: '#/context/definitions/scopes/oai/level'
        account:
          $ref: '#/context/definitions/scopes/oai/account'
      over:
        requests:
          $ref: '#/terms/metrics/requests'
      of: Array[ScopedRateObject]

ScopedRateObject

Holds the main information of a SLA single scoped rate.

Field name	Field type	Required/Optional	Description
scope	Object	Required	scoped rate scope
limits	Array[LimitObject]	Required	holds the main information of a SLA scoped rate limit

Example

Synthetic

-   scope:
        myScope:
            $ref: '#/context/definitions/scopes/myGlobalScope/myScope'
    limits: Array[LimitObject]  

SLA for API services

- scope:
    plan: '*'
    resource: /pets
    operation: get
    level: account
    account: '*'
  limits:
    - max: 3
      period: secondly
- scope:
    plan: free
    resource: /pets
    operation: get
    level: account
    account: '*'
  limits:
    - max: 1
      period: secondly

Examples

• A basic and synthetic example, in YAML and JSON format, compliant with the current iAgree specification version.
• A SLA for an API service, in YAML and JSON format, which defines some pricing plans and quotas/rates over "pets" resources.
• A SLA for a human service, in YAML and JSON format, that tries to regulate some metrics and guantees in a "IT service desk" process.

References

1. Keywords to indicate requirement levels - RFC 2119.
2. JSON
3. YAML
4. Date and time encoding - ISO 8601
5. Currency codes - ISO 4217