Application service level expectation health and performance

A method comprising:

• obtaining, by processing circuitry of a network management system (NMS) of an enterprise network, path data of a plurality of network devices operating as network gateways for the enterprise network, wherein the path data of a first network gateway is associated with one or more logical paths of a physical interface of the first network gateway with one or more other network gateways over a wide area network (WAN);
• determining, by the processing circuitry and based on the path data, one or more application health assessments of an application of a plurality of applications, wherein the one or more application health assessments are associated with one or more application sessions of the application during each application time period of a sequence of consecutive application time periods, wherein each an application time period corresponds to a period of time during which an application server of the application in communication with the first network gateway provides service over the one or more application sessions to a client device within a site of the enterprise network via a logical path of the one or more logical paths of the first network gateway with a second network gateway for the site over the WAN, and wherein an application session of the one or more application sessions includes data flows between at least the first network gateway and the second network gateway during the application time period;
• determining, by the processing circuitry, at least one application time period in the sequence of consecutive application time periods as a failure state of the application based on the one or more application health assessments for the one or more application sessions during the application time period;
• and
• based on determining the at least one application time period as a failure state, outputting, by the processing circuitry, a notification including identification of a root cause of the failure state.

Non-transitory computer-readable storage media comprising instructions for causing one or more processors of a network management system (NMS) of an enterprise network to:

• obtain path data of a plurality of network devices operating as network gateways for the enterprise network, wherein the path data of a first network gateway is associated with one or more logical paths of a physical interface of the first network gateway with one or more other network gateways over a wide area network (WAN);
• determine, based on path data, one or more application health assessments of an application of a plurality of applications, wherein the one or more application health assessments are associated with one or more application sessions of the application during each application time period of a sequence of consecutive application time periods, wherein an application time period corresponds to a period of time during which an application server of the application in communication with the first network gateway provides service over the one or more application sessions to a client device within a site of the enterprise network via a logical path of the one or more logical paths of the first network gateway with a second network gateway for the site over the WAN, and wherein an application session of the one or more application sessions includes data flows between at least the first network gateway and the second network gateway during the application time period;
• determine at least one application time period in the sequence of consecutive application time periods as a failure state of the application based on the one or more application health assessments for the one or more application sessions during the application time period;
• and
• based on determining the at least one application time period as a failure state, outputting a notification including identification of a root cause of the failure state.