There is currently no icinga instance writing to the IDO

I resolved, need edit the file /etc/icinga2/features-enabled/ido-mysql.conf and insert db/user/passwd

My file is:

library "db_ido_mysql"

object IdoMysqlConnection "ido-mysql" {
  user = "icinga",
  password = "password",
  host = "localhost",
  database = "icinga"
}

On Debian systems, after the default installation and configuration of the IDO package, this file is actually pre-generated in /etc/icinga2/features-available/ido-pgsql.conf or similar, you just need to symlink it into /etc/icinga2/features-enabled/, and restart the icinga2 service.