Soften alerts about mysql replication

tasks/configure.yml

@@ -38,6 +38,7 @@
   with_items:
     - fluentd_buffer
     - httpcheck
+    - mysql
     - oracle
   notify:
     - Restart NetData

templates/health.d/mysql.conf

+ template: mysql_replication_lag
+       on: mysql.slave_behind
+    class: Latency
+     type: Database
+component: MySQL
+     calc: $seconds
+    units: seconds
+    every: 10s
+     warn: $this > (($status >= $WARNING)  ? (5)  : (80))
+     crit: $this > (($status == $CRITICAL) ? (80) : (160))
+    delay: down 15m multiplier 1.5 max 1h
+     info: Custom difference between the timestamp of the latest transaction processed by the SQL thread and \
+           the timestamp of the same transaction when it was processed on the master
+       to: dba