Function apply_function 

pub fn apply_function(
    function: AggregateFunction,
    metrics: &[MetricRecord],
) -> Result<f64, Status>

Applies the aggregation function to a set of metrics.

This function implements metric-specific aggregation by operating directly on MetricRecord instances. It uses the appropriate running window value based on the aggregation function type.

Arguments

• function - The aggregation function to apply
• metrics - The set of metrics to aggregate

Returns

The aggregated value as a float, or an error if the operation fails