Prometheus metrics

syz-manager metrics are exposed at the URI /metrics on the http endpoint. Currently exported prometheus metrics from the manager are syz_exec_total, syz_corpus_cover and syz_crash_total.

These metrics can be ingested using following prometheus client configuration:

scrape_configs:
- job_name: syzkaller
  scrape_interval: 10s
  static_configs:
  - targets:
    - localhost:56741

Values are reset to zero at syz-manager restart and only reflect for current execution of syz-manager.