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Instead of unconditionally randomizing, extend leases on promotion if too many leases expire within the same time span. If the server has few leases or spread out expires, there will be no extension. Squashed previous commits for https://github.com/coreos/etcd/pull/8149. Author: Anthony Romano <anthony.romano@coreos.com> This is a combination of 4 commits below: lease: randomize expiry on initial refresh call Randomize the very first expiry on lease recovery to prevent recovered leases from expiring all at the same time. Address https://github.com/coreos/etcd/issues/8096. integration: remove lease exist checking on randomized expiry Lease with TTL 5 should be renewed with randomization, thus it's still possible to exist after 3 seconds. lessor: extend leases on promote if expires will be rate limited Instead of unconditionally randomizing, extend leases on promotion if too many leases expire within the same time span. If the server has few leases or spread out expires, there will be no extension. Revert "integration: remove lease exist checking on randomized expiry" This reverts commit 95bc33f37f7c31a4cd06287d44879a60baaee40c. The new lease extension algorithm should pass this test.