If you've set up remote log streaming, you can log URL purge requests by adding the following VCL to the vcl_recv subroutine. For example:
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if (req.method == "FASTLYPURGE") {
log {"syslog "} req.service_id {" my-log-endpoint :: "}
{"event=purge; "}
{"service="} req.service_id {"; "}
;
}
The my-log-endpoint must match the name of your logging endpoint in the Fastly web interface.
You can add the VCL via custom VCL or VCL Snippets.
NOTE
Purge all requests are logged in the audit log and event log. Key purge requests can't be logged.