17037 FIX Adapt change from werk #17035 for MariaDB

With the change introduced with werk #17035, if a system was using a MariaDB version higher than 8, it would cause the MySQL DB service to go to unknown.
This was due to the fact that the command 'SHOW REPLICA STATUS' is not available in MariaDB version lower than 10.5.

Change-Id: I4dc1e830c729cced06b77069e5291a13e14e1a3c

.werks/17035.md

@@ -9,10 +9,10 @@ class      | feature
 edition    | cre
 component  | checks
 level      | 1
-compatible | yes
+compatible | no
 
 From MySQL 8.0.22, SHOW SLAVE STATUS is deprecated and the alias SHOW REPLICA STATUS should be used instead.
 The statement works in the same way as before, only the terminology used for the statement and its output has changed.
 
 For the sake of compatibility, the service name will stay the same 'MySQL Slave'.
-There is no user intervention required.
+The user needs to update the agent in order for this to change to work as intended.

.werks/17037.md

@@ -0,0 +1,15 @@
+[//]: # (werk v2)
+# Adapt change from werk #17035 for MariaDB
+
+key        | value
+---------- | ---
+date       | 2024-09-27T22:58:37+00:00
+version    | 2.4.0b1
+class      | fix
+edition    | cre
+component  | checks
+level      | 1
+compatible | yes
+
+With the change introduced with werk #17035, if a system was using a MariaDB version higher than 8, it would cause the MySQL DB service to go to unknown.
+This was due to the fact that the command 'SHOW REPLICA STATUS' is not available in MariaDB version lower than 10.5.

agents/plugins/mk_mysql

@@ -37,12 +37,17 @@ do_query() {
             FROM information_schema.TABLES GROUP BY table_schema"
 
     MYSQL_VERSION=$($MYSQL --defaults-file="$MK_CONFDIR"/mysql.cfg ${1:+--socket="$1"} -s -e "SELECT VERSION();" | grep -o '^[0-9]\+')
+    MYSQL_FULL_VERSION=$($MYSQL --defaults-file="$MK_CONFDIR"/mysql.cfg ${1:+--socket="$1"} -s -e "SELECT VERSION();")
+
     echo "<<<mysql_replica_slave>>>"
     echo "$INSTANCE_HEADER"
-    if [ "$MYSQL_VERSION" -ge 8 ]; then
-        STATUS_COMMAND="show replica status\G"
+
+    if echo "$MYSQL_FULL_VERSION" | grep -q "MariaDB"; then
+        STATUS_COMMAND="SHOW SLAVE STATUS\G"
+    elif [ "$MYSQL_VERSION" -ge 8 ]; then
+        STATUS_COMMAND="SHOW REPLICA STATUS\G"
     else
-        STATUS_COMMAND="show slave status\G"
+        STATUS_COMMAND="SHOW SLAVE STATUS\G"
     fi
     $MYSQL --defaults-file="$MK_CONFDIR"/mysql.cfg ${1:+--socket="$1"} -s \
         -e "$STATUS_COMMAND"