Script to get replication Undistributed Commands

Script to Monitor Replication by checking last refresh time and pending commands

SELECT ( CASE
           WHEN Mdh.Runstatus = '1' THEN 'Start'
           WHEN Mdh.Runstatus = '2' THEN 'Succeed'
           WHEN Mdh.Runstatus = '3' THEN 'InProgress'
           WHEN Mdh.Runstatus = '4' THEN 'Idle'
           WHEN Mdh.Runstatus = '5' THEN 'Retry'
           WHEN Mdh.Runstatus = '6' THEN 'Fail'
         END )                                 [Run status],
       Mda.Subscriber_db                       [Subscriber db],
       Mda.Publication                         [Pub name],
       Mdh.[Time]                              [Lastsynchronized],
       Und.Undelivcmdsindistdb                 [Undistcom],
       Mdh.Comments                            [Comments],
       DATEDIFF(SECOND, Mdh.[Time], GETDATE()) Lastrefresh
FROM   DISTRIBUTION.DBO.Msdistribution_agents Mda
       LEFT JOIN DISTRIBUTION.DBO.Msdistribution_history Mdh
              ON Mdh.Agent_id = Mda.Id
       JOIN (SELECT S.AGENT_ID,
                    Maxagentvalue.[Time],
                    SUM(CASE
                          WHEN Xact_seqno > Maxagentvalue.Maxseq THEN 1
                          ELSE 0
                        END) AS Undelivcmdsindistdb
             FROM   DISTRIBUTION.DBO.Msrepl_commands T (NOLOCK)
                    JOIN DISTRIBUTION.DBO.Mssubscriptions AS S (NOLOCK)
                      ON ( T.ARTICLE_ID = S.ARTICLE_ID
                           AND T.PUBLISHER_DATABASE_ID = S.PUBLISHER_DATABASE_ID
                         )
                    JOIN (SELECT Hist.AGENT_ID,
                                 MAX(Hist.[TIME]) AS [Time],
                                 H.Maxseq
                          FROM   DISTRIBUTION.DBO.Msdistribution_history Hist (
                                 NOLOCK)
                                 JOIN (SELECT Agent_id,
                                              ISNULL(MAX(Xact_seqno), 0x0) AS
                                              Maxseq
                                       FROM
                                 DISTRIBUTION.DBO.Msdistribution_history (
                                 NOLOCK)
                                       GROUP  BY Agent_id) AS H
                                   ON ( Hist.AGENT_ID = H.Agent_id
                                        AND H.Maxseq = Hist.XACT_SEQNO )
                          GROUP  BY Hist.AGENT_ID,
                                    H.Maxseq) AS Maxagentvalue
                      ON Maxagentvalue.Agent_id = S.AGENT_ID
             GROUP  BY S.AGENT_ID,
                       Maxagentvalue.[Time]) Und
         ON Mda.Id = Und.Agent_id
            AND Und.[Time] = Mdh.[Time]
ORDER  BY Mdh.[Time] DESC

Regards,
Nirav Gajjar