Is this an integration between Gmail, Pipedrive, and Strkr?
No. This page frames Strkr as the replacement for the Gmail-plus-Pipedrive stack. Strkr has native Gmail sync and a native pipeline, so the team drops Pipedrive and keeps Gmail. Strkr does publish an open API and webhooks for teams running a short parallel period or exporting from Pipedrive during migration, but the end state is one platform, not three.