MySQL exporter reporting wrong values for cluster status (wsrep_cluster_status)

MySQLd exporters instruments wsrep_cluster_status as:

...
 if bytes.Compare(data, []byte("Non-Primary")) == 0 || bytes.Compare(data, []byte("Disconnected")) == 0 {

  return 0, true

 }
...

buy WSREP reports the state as non-Primary, not Non-Primary:

static const char*  cluster_status_str[WSREP_VIEW_MAX] =

{

    "Primary",

    "non-Primary",

    "Disconnected"

};

DoD:

• Our version of mysqld_exporter fixed
• Dashboard present correct information
• PR for upstream created

Out of scope:

• waiting for fix this on the upstream side, just send PR for them
• Update of PS documentation

DOC:  Correct status (non_Primary) has to be shown in documentation too
https://www.percona.com/doc/percona-xtradb-cluster/LATEST/wsrep-status-index.html