# Metrics

The `silentct-mon` program emits Prometheus metrics -- enable using the `-m`
option.  For a *bash example* of how to create appropriate alerts from these
Prometheus metrics, see [scripts/silentct-check](../scripts/silentct-check).

## `"silentct_log_size"`

```
# HELP silentct_log_size The number of entries in the log.
# TYPE silentct_log_size gauge
silentct_log_size{id="TnWjJ1yaEMM4W2zU3z9S6x3w4I4bjWnAsfpksWKaOd8="} 6.07308178e+08
```

`id` is a unique log identifier in base64 (computed as in RFC 6962, §3.2).

## `"silentct_log_index"`

```
# HELP silentct_log_index The next log entry to be downloaded.
# TYPE silentct_log_index gauge
silentct_log_index{id="TnWjJ1yaEMM4W2zU3z9S6x3w4I4bjWnAsfpksWKaOd8="} 6.07307424e+08
```

`id` is a unique log identifier in base64 (computed as in RFC 6962, §3.2).

## `"silentct_log_timestamp"`

```
# HELP silentct_log_timestamp The log's UNIX timestamp in ms.
# TYPE silentct_log_timestamp gauge
silentct_log_timestamp{id="TnWjJ1yaEMM4W2zU3z9S6x3w4I4bjWnAsfpksWKaOd8="} 1.735992491111e+12
```

`id` is a unique log identifier in base64 (computed as in RFC 6962, §3.2).

## `"silentct_certificate_alert"`

```
# HELP silentct_certificate_alert The time the certificate without allowlisting was found.
# TYPE silentct_certificate_alert gauge
silentct_certificate_alert{stored_at="/path/to/state/crt_found/<log-hex-id>-<log-index>.json"} 1.735992551e+09
```

`stored_at` is where the log entry is stored on the monitor's local file system.
For convenience, the parsed log-entry certificate is also available as `.der`.

## `"silentct_error_counter"`

```
# HELP silentct_error_counter The number of errors propagated to the main loop.
# TYPE silentct_error_counter counter
silentct_error_counter 0
```

Do not use for alerting, this metric is too noisy and currently used for debug.