message: identity: rename OS version metrics
  This renames the OS version label to be less generic, making its
  usage more meaningful at query-time.
diff: @@ -22,10 +22,10 @@ lazy_static::lazy_static! {
  "zincati_identity_rollout_wariness",
  "Client wariness for updates rollout"
  ).unwrap();
  - static ref OS_VERSION: IntGaugeVec = register_int_gauge_vec!(
  - "zincati_identity_os_version",
  - "OS version of the booted deployment",
  - &["value"]
  + static ref OS_INFO: IntGaugeVec = register_int_gauge_vec!(
  + "zincati_identity_os_info",
  + "Information about the underlying booted OS",
  + &["os_version"]
  ).unwrap();
  }
  @@ -72,9 +72,7 @@ impl Identity {
  }
  // Export info-metrics with details about booted deployment.
  - OS_VERSION
  - .with_label_values(&[&id.current_os.version])
  - .set(1);
  + OS_INFO.with_label_values(&[&id.current_os.version]).set(1);
  Ok(id)
  }
  