Stat Rule

You can pre-process data received from sensors before displaying it in the Data Table. To do this, you can set entity’s stat rule with Set Object Stat Rules and Set Link Stat Rules

Stat rules is a set of actions that modify the data received in the monitoring process under certain conditions. See the Data forming rules section on the SAYMON wiki for more information.

Stat Rule Model

Field Type Description

conditions

Array

Conditions under which actions are applied to the data. If conditions aren’t set, actions will be performed each time the server receives data.

actions

Array

Actions applied to the data.

Conditions

Field Type Description

_field

Object

The stat rule condition.

_field.name

String

The name of the metric that will be tested.

_field.value

Object

The metric value, which the current value is compared with, and a comparison operator. See the Value section for more information.

Value

Format of the value field:

"operator": "value"

Supported operators:

Field Description

_ct

Contains

_eq

Equal to

_gt

Greater than

_gte

Greater than or equal to

_lt

Less than

_lte

Less than or equal to

_m

Matches with

_nct

Not contains

_neq

Not equal to

Actions

Action structure depends on the type of the action.

Field Type Description

type

String

The type of action. Possible values are set, extend and drop.

field

String

Name of the metric which the value should be written into. If there is no metric with that name, the metric will be added to the Data table.

value

String

Value which will be written into the metric. See the Value section for more information.

Value

Value can be:

  • numeric values, for example, 10

  • text data, for example, "text"

  • values of other metrics from the data table with the pointers current and new, for example, "{{new.temperature}}"

  • formulas using metrics from the data table with the pointers current and new, for example, "{{current.temperature}} - {{new.temperature}}"