alt_name will be used by metric exporters to know how the metric should be
presented to the user. If the alt_name is NULL, the metric should be
ignored. For now only promex exporter will make use of this.
struct stat_col {
const char *name; /* short name, used notably in CSV headers */
const char *desc; /* user-friendly description */
+ const char *alt_name; /* name used by some stats provider such as promex addon, ignored if NULL */
uint32_t type; /* combination of field_nature and field_format */
uint8_t cap; /* mask of stats_domain_px_cap to restrain metrics to an object types subset */