In a computer-implemented method for performing alert notification on streaming textual data, streaming textual data is received. A plurality of copies of the streaming textual data is generated, wherein a first copy of the streaming textual data is transmitted to an ingestion service for persistent storage at a data plane and a second copy of the streaming textual data is transmitted to an alert evaluation service for performing alert evaluation on the streaming textual data, such that the ingestion service and the alert evaluation service are performed independently. The streaming textual data is evaluated by the alert evaluation service to detect an alert. Responsive to detecting an alert at the alert evaluation service, a notification of the alert is generated.