The user can declare how often a metric should be measured

[mtneug]

Description

The pace of change is different for each metric. Also some services need to be autoscaled quicker than others (see #15). To accurately asses the current situation users must be able to specify how often spate should measure a specific metric. Users can set this rate on a per metric base. If no rate is set, the default one is used. The default can be set globally by an administrator.

Design

The measurement period is set per metric. spate looks for the label de.mtneug.spate.metrics.<key>.observer.period. The value has to be an time entry. The default period can be set via the CLI option --default-observer-period. If no is set 30s is used.

Example

# Setting the global default
$ spate --default-observer-period=10s

# Overwriting the default
$ docker service create \
   --name service \
   --label de.mtneug.spate.metrics.cpu.type=cpu \
   --label de.mtneug.spate.metrics.cpu.observer.period=10s \
   ...
   my/service