> Task object
- ‘Check now’ request object
- ‘Diagnostic information’ request object
  - Statistic request object
    - List of statistic fields available for each type of diagnostic information request
    - List of sorting fields available for each type of diagnostic information request
  - Statistic result object

> Task object

The following objects are directly related to the task API.

The task object has the following properties:

Property	Type	Description
taskid	string	(readonly) ID of the task.
type (required)	integer	Type of the task. Possible values: 1 - Diagnostic information; 6 - Check now.
status	integer	(readonly) Status of the task. Possible values: 1 - new task; 2 - task in progress; 3 - task is completed; 4 - task is expired.
clock	timestamp	(readonly) Time when the task was created.
ttl	integer	(readonly) The time in seconds after which task expires.
proxy_hostid	string	ID of the proxy about which diagnostic information statistic is collected. Ignored for ‘Check now’ tasks.
request (required)	object	Task request object according to the task type: Object of ‘Check now’ task is described in detail below; Object of ‘Diagnostic information’ task is described in detail below.
result	object	(readonly) Result object of the diagnostic information task. May contain NULL if result is not yet ready. Result object is described in detail below.

‘Check now’ request object

The ‘Check now’ task request object has the following properties.

Property	Type	Description
itemid	string	ID of item and low-level discovery rules.

‘Diagnostic information’ request object

The diagnostic information task request object has the following properties. Statistic request object for all types of properties is described in detail below.

Property	Type	Description
historycache	object	History cache statistic request. Available on server and proxy.
valuecache	object	Items cache statistic request. Available on server.
preprocessing	object	Preprocessing manager statistic request. Available on server and proxy.
alerting	object	Alert manager statistic request. Available on server.
lld	object	LLD manager statistic request. Available on server.

Statistic request object

Statistic request object is used to define what type of information should be collected about server/proxy internal processes. It has the following properties.

Property	Type	Description
stats	query	Statistic object properties to be returned. The list of available fields for each type of diagnostic information statistic are described in detail below. Default: `extend` will return all available statistic fields.
top	object	Object to sort and limit returned statistic values. The list of available fields for each type of diagnostic information statistic are described in detail below. Example: { “source.alerts”: 10 }

List of statistic fields available for each type of diagnostic information request

Following statistic fields can be requested for each type of diagnostic information request property.

Diagnostic type	Available fields	Description
historycache	items	Number of cached items.
	values	Number of cached values.
	memory	Shared memory statistics (free space, number of used chunks, number of free chunks, max size of free chunk).
	memory.data	History data cache shared memory statistics.
	memory.index	History index cache shared memory statistics.
valuecache	items	Number of cached items.
	values	Number of cached values.
	memory	Shared memory statistics (free space, number of used chunks, number of free chunks, max size of free chunk).
	mode	Value cache mode.
preprocessing	values	Number of queued values.
preprocessing	preproc.values	Number of queued values with preprocessing steps.
alerting	alerts	Number of queued alerts.
lld	rules	Number of queued rules.
lld	values	Number of queued values.

List of sorting fields available for each type of diagnostic information request

Following statistic fields can be used to sort and limit requested information.

Diagnostic type	Available fields	Type
historycache	values	integer
valuecache	values	integer
valuecache	request.values	integer
preprocessing	values	integer
alerting	media.alerts	integer
alerting	source.alerts	integer
lld	values	integer

Statistic result object

Statistic result object is retrieved in result field of task object.

Property	Type	Description
status	integer	(readonly) Status of the task result. Possible values: -1 - error occurred during performing task; 0 - task result is created.
data	string/object	Results according the statistic request object of particular diagnostic information task. Contains error message string if error occurred during performing task.