v2.13.6

What's Changed

• Add ra:key_metrics/2 by @dumbbell in #461
• ra_server: Add a new last_applied state query by @dumbbell in #462
• Stop checkpoint validation when encountering a valid checkpoint by @the-mikedavis in #463
• Kill snapshot process before deleting everything by @kjnilsson in #464

Full Changelog: v2.13.5...v2.13.6