I have tried the following commands, still the same issue,
pmm-admin add mysql --query-source=perfschema --username=pmm --password=pass --service-name=MYSQL_NODE --socket=/var/run/mysqld/mysqld.sock
Connection check failed: Error 1045: Access denied for user 'pmm'@'localhost' (using password: YES).
pmm-admin add mysql --query-source=perfschema --server-insecure-tls --username=pmm --password=pass --service-name=MYSQL_NODE --socket=/var/run/mysqld/mysqld.sock
Connection check failed: Error 1045: Access denied for user 'pmm'@'localhost' (using password: YES).
Seems like a similar issue, but it did’nt help me solve my error.