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Check the current replication lag.

Returns database server with the highest replication lag.

Elasticsearch error: $1

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There seems to be a technical issue. You can $1 if it persists. Error: $2

Maximum lag can be used when MediaWiki is installed on a database replicated cluster. To save actions causing any more site replication lag, this parameter can make the client wait until the replication lag is less than the specified value. In case of excessive lag, error code <samp>maxlag</samp> is returned with a message like <samp>Waiting for $host: $lag seconds lagged</samp>.<br />See [[mw:Special:MyLanguage/Manual:Maxlag_parameter|Manual: Maxlag parameter]] for more information.