Latency configuration

These Liberator configuration items allow Liberator to add timestamps to objects for the purpose of latency measurement.

Because Liberator is a Datasource application, you can also set the DataSource latency chain configuration items.

Contents:

timestamp-field

timestamp-field specifies the name of a timestamp field that Liberator should add to an update message, if a field of the same name is not included in the update. This timestamp field is only added to update messages; it is not included each time the object is requested from Liberator’s cache.

This timestamping facility is independent of latency chain timestamps, and it isn’t controlled by the value of the latency-chain-enable configuration item.. It is useful for timestamping the time of exit from Liberator of updates that do not already contain a latency-chain timestamp field (usually added in the originating integration adapter).

Liberator automatically adds latency-chain timestamps to update messages that contain a latency-chain timestamp field, so to avoid timestamp-field adding a duplicate timestamp, we recommend setting timestamp-field to the name of the field used to record latency-chain timestamps. On updates that already contain this field, the timestamp-field option does nothing.

This configuration item is overridden by the timestamp-field option of add-object for that particular object only.

By default, the value of timestamp-field is null (unset), and Liberator only writes timestamps to objects that have been defined by add-object and have the timestamp-field option specified.

Timestamp format and precision
Liberator version Format Example

< 7.1.0

Milliseconds since 1 Jan 1970

1509967184123

7.1.0

Microseconds since 1 Jan 1970

1509967184123456

> 7.1.0

Seconds since 1 Jan 1970, with a nanosecond fractional component

1509967184.123456789

Syntax: timestamp-field <field-name>

Type: string

Default value: null

See also: