# CompareTo

Comparison baseline types for alert rule thresholds.

Determines what the current metric value should be compared against when evaluating alert conditions.

## TIME\_PERIOD

Compare to a historical time period (relative comparison). Useful for detecting changes over time, seasonal patterns, etc. When using TIME\_PERIOD, the compare\_bin\_delta parameter specifies how many time periods back to compare against.

## RAW\_VALUE

Compare to an absolute threshold value (absolute comparison). Useful for hard limits and business rule enforcement. When using RAW\_VALUE, compare\_bin\_delta is ignored.

{% hint style="warning" %}
When using TIME\_PERIOD, the allowed compare\_bin\_delta values depend on bin\_size:
{% endhint %}

## Example

```python
# Compare current hourly drift to same hour yesterday (24 hours ago)
alert_rule = AlertRule(
        compare_to=CompareTo.TIME_PERIOD,
        bin_size=BinSize.HOUR,
        compare_bin_delta=24  # 24 hours ago
    )

    # Compare daily metrics to last week (7 days ago)
    alert_rule = AlertRule(
            compare_to=CompareTo.TIME_PERIOD,
            bin_size=BinSize.DAY,
            compare_bin_delta=7  # 7 days ago
        )

        # Compare current accuracy to absolute minimum (no time comparison)
        alert_rule = AlertRule(
                compare_to=CompareTo.RAW_VALUE,
                threshold=0.85  # Must be above 85%
            )
```

## TIME\_PERIOD *= 'time\_period'*

## RAW\_VALUE *= 'raw\_value'*