SOLVED.Zabbix. Is JSON data broken?

Question

JSON

There is a query in the data element that pulls out the necessary values:

Everything worked fine, until today, there is an incomprehensible break, what could be the reason?

There is such a line in the errors, but there are no problems from the side of the server from which it reads
( Item preprocessing step #1 failed: cannot extract value from json by path "$.data.turn_count": cannot parse as a valid JSON object: invalid object format, expected opening character '{' or '[' at: 'PHP Warning: mysqli_real_connect(): (HY000/1040): Too many connections in /var/www/include/function.php on line 6
PHP Warning: mysqli_ping( ) expects )
the database has crashed. For such an amount of time and here you are!

Answer 1

Your database has crashed.
(Now you can mark my answer as a solution).