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=over 4

=item events

Array reference of event hashrefs (C<type> = "PUT" or "DELETE", C<kv>, and
optionally C<prev_kv> when the C<prev_kv> option is set).

=item watch_id

Server-assigned watch identifier. Note that etcd assigns a fresh id for
each Watch stream, so this value can change if the watch transparently
reconnects.

=item created

True on the first message after the watch is established.

=item header

Cluster response header.