In 9.0beta3 the function GetLatestXLogTime() was removed

and replaced by GetLatestXTime() but this function cannot
be called from external programs.
Instead now we are using GetXLogReceiptTime() which tells
us what was the last time we got a WAL record by streaming
or file.

sql_utils/repmgr_wrapper_funcs.c

@@ -20,10 +20,16 @@ PG_FUNCTION_INFO_V1(last_xlog_replay_timestamp);
 Datum
 last_xlog_replay_timestamp(PG_FUNCTION_ARGS)
 {
+TimestampTz rTime;
+bool        fromSource;
+
 	if (!InRecovery)
 		PG_RETURN_NULL();
 	else
-	    PG_RETURN_TIMESTAMPTZ(GetLatestXLogTime());
+	{
+		GetXLogReceiptTime(&rTime, &fromStream);
+	    PG_RETURN_TIMESTAMPTZ(rTime);
+	}
 }