Auto-scaling adapter for Streaming Data Pipelines
The AlertWebHookApplication is a Prometheus Alertmanager Webhook Receiver
that listens for pre-configured Prometheus alerts and leverages the SCDF Scale API to scale out or in a preconfigured
stream application.
Use the scdf.alert.webhook.scaleOutAlertName and scdf.alert.webhook.scaleInAlertName to configure the names of the scale-out and scale-in alert names.
On scale-out alert, the AlertWebHookApplication increases the number of application (defined by scdf.alert.webhook.scaleApplicationName or application_name alert label) instances to the scdf.alert.webhook.scaleOutFactor count.
On scale-in alert, the AlertWebHookApplication decreases the number of application (defined by scdf.alert.webhook.scaleApplicationName or application_name alert label) instances to the scdf.alert.webhook.scaleInFactor count.
The stream name should be provided either as scdf.alert.webhook.scaleStreamName property or an Alert label called: stream_name.
The application name should be provided either as scdf.alert.webhook.scaleApplicationName property or an Alert label called: application_name.
Internally, AlertWebHookApplication uses the Data Flow Scale REST API to scale the app instances in platform agnostic way.
Use the spring.cloud.dataflow.client.server-uri property to configure url of the Data Flow server.
Following video illustrates the overall flow and the role for the AlertWebHookApplication:
