Add docs for cluster.reconnect flags (#1991)
Add docs for cluster.reconnect flags (#1991)

fixes #1820

Signed-off-by: Christoph Maser <3202d820d8c807354da792923f99608b3731ee7c@gmail.com>
GoogleCloudPlatform/alertmanager,prometheus/alertmanager,GoogleCloudPlatform/alertmanager,GoogleCloudPlatform/alertmanager,prometheus/alertmanager,GoogleCloudPlatform/alertmanager,prometheus/alertmanager,prometheus/alertmanager