extend metrics list to prometheus

[allanian]

Hello, good day, i have a question, how i can extend metrics list, what sended to prometheus?
e.g. opcache_last_restart_time.
what i get for now:
opcache_keyHits_misses{clusterName="project1", groupName="rv-site", hostName="rv-site-back04-company.com", instance="opcache-dashboard:42042", job="opcache-dashboard"} 399 opcache_keys_free{clusterName="project1", groupName="rv-site", hostName="rv-site-back04-company.com", instance="opcache-dashboard:42042", job="opcache-dashboard"} 64899 opcache_keys_usedKeys{clusterName="project1", groupName="rv-site", hostName="rv-site-back04-company.com", instance="opcache-dashboard:42042", job="opcache-dashboard"} 508 opcache_keys_usedScripts{clusterName="project1", groupName="rv-site", hostName="rv-site-back04-company.com", instance="opcache-dashboard:42042", job="opcache-dashboard"} 399 opcache_memory_free_bytes{clusterName="project1", groupName="rv-site", hostName="rv-site-back04-company.com", instance="opcache-dashboard:42042", job="opcache-dashboard"} 457799568 opcache_memory_used_bytes{clusterName="project1", groupName="rv-site", hostName="rv-site-back04-company.com", instance="opcache-dashboard:42042", job="opcache-dashboard"} 79071344 opcache_memory_wasted_bytes{clusterName="project1", groupName="rv-site", hostName="rv-site-back04-company.com", instance="opcache-dashboard:42042", job="opcache-dashboard"} 0 opcache_scripts_count{clusterName="project1", groupName="rv-site", hostName="rv-site-back04-company.com", instance="opcache-dashboard:42042", job="opcache-dashboard"} 399 scrape_duration_seconds{instance="opcache-dashboard:42042", job="opcache-dashboard"} 0.00063237 scrape_samples_post_metric_relabeling{instance="opcache-dashboard:42042", job="opcache-dashboard"} 8 scrape_samples_scraped{instance="opcache-dashboard:42042", job="opcache-dashboard"} 8 scrape_series_added{instance="opcache-dashboard:42042", job="opcache-dashboard"} 0 up{instance="opcache-dashboard:42042", job="opcache-dashboard"}