Revert "L2SS-541: delete mariadb entry from elk"

This reverts commit 43f469ef.

docker-compose/elk/logstash/conf.d/23-parse-maria-db.conf

+filter {
+  # mark all our mariadb instances
+  grok {
+    match => {
+      "program" => [ "archiver-maria-db", "tangodb" ]
+    }
+    add_tag => [ "mariadb" ]
+  }
+
+  # parse mariadb output
+  if "mariadb" in [tags] {
+    grok {
+      match => {
+        "message" => [
+          "%{TIMESTAMP_ISO8601:timestamp} .%{WORD:level}. %{GREEDYDATA:message}",
+          "%{TIMESTAMP_ISO8601:timestamp} 0 .%{WORD:level}. %{GREEDYDATA:message}"
+        ]
+      }
+      "overwrite" => [ "timestamp", "level", "message" ]
+    }
+    mutate {
+      gsub => [
+        "level", "Note", "Info"
+      ]
+      uppercase => [ "level" ]
+    }
+    date {
+      match => [ "timestamp", "YYYY-MM-dd HH:mm:ssZZ", "YYYY-MM-dd HH:mm:ss", "YYYY-MM-dd  H:mm:ss"  ]
+      timezone => "UTC"
+    }
+  }
+}