anchor.diff:  ## Facts Collection [/{tenantid}/servers/{serverid}]
   ### Create new facts associated to a server [POST]
   This operation updates the context related to a specific server, identified with its serverId. The context information contains the description of the CPU, Memory, Disk and/or Network usages. This message follows the NGSI-10 information model but using JSON format and the response has no body.
  +
  +Attributes:
  +Context element contains different measures. Each measure is an attribute which contains:
  +
  +* `name`: The name of the monitored attribute (usedMemPct, cpuLoadPct, netLoadPct, freeSpacePct).
  +* `value`: The value of the attribute.
  +* `type`: The type of the value (this component uses string).
  +
  +In addition there are three more attributes inside the context element:
  +
  +* `id`: Subscription unique identifier. Automatically created at creation time in the Context Broker.
  +* `isPattern`: it shows if the query is related to a regular expression for the entity ID. (false, true)
  +* `type`: The type of the context element (this component uses "host").
  +
  +Finally, Context element is involved into a context response, which also contains 
  +
  +* `statusCode`: with the result of the context broker query.
  +
   + Parameters
       + tenantid (required, text, `d3fdddc6324c439780a6fd963a9fa148`) ... Numeric `id` of the Tenant to perform action with. Has example value.
       + serverid (required, text, `52415800-8b69-11e0-9b19-734f6af67565`) ... Numeric `id` of the 
  
positive.code: ## Subscriptions Collection [/{tenantid}/servers/{serverid}/subscription]
  ### Create a new subscription [POST]
  This operation creates a new subcription associated to a rule
  + Parameters
      + tenantid (required, text, `d3fdddc6324c439780a6fd963a9fa148`) ... Alphanumeric `id` of the Tenant to perform action with. Has example value.
      + serverid (required, text, `52415800-8b69-11e0-9b19-734f6af67565`) ... Alphanumeric `id` of the server following the OpenStack ID format.
  
negative.code: 
  ### Update the window size [PUT]
  This call updates the window size of the service in order to change the stabilization window size to be applied to the monitoring data received from the Monitoring GE
  
  Attributes:
  
  * `windowsize`: The value of the windowsize to be updated (must be an integer between 1 and the max_window_size value defined in the settings file).
  
  + Parameters
      + tenantid (required, text, `d3fdddc6324c439780a6fd963a9fa148`) ... Numeric `id` of the Tenant to perform action with. Has example value.
  
  