How to collect statistics from SSR using SNMP or API to track in an external tool

Please see the SNMP or API documentation for options.

SNMP documentation:

https://www.juniper.net/documentation/us/en/software/session-smart-router/docs/config_snmp/

For API access to statistics for conductor managed SSR:

https://www.juniper.net/documentation/us/en/software/session-smart-router/docs/concepts_monitoring/#metric-collector

"REST API documentation is available from the "About This System" page in the SSR GUI."