note that we ignore errors that files are too large to push (limitation for server side: 1.5 MiB, client side: 2 MiB), because they are not etcd meant to maintain

see https://etcd.io/docs/v3.3/upgrades/upgrade_3_2/#changed-maximum-request-size-limits-3210 (old change log),

https://github.com/etcd-io/etcd/blob/08407ff7600eb16c4445d5f21c4fafaf19412e24/client/v3/config.go#L46

TODO

for pusher, only push modified files as key to etcd, currently we push all keys in repo

for clientv3, we need to check behavior when etcd is down (should reconnect?)

documentation

check stats implementation