LATEST

LATEST billable metric

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API

Here is how you can create a latest aggregation from the UI:

Access the “Billable metrics” section via the side menu;
Create a new billable metric;
Define a name, a code and an optional description;
Select “latest” as the aggregation type;
Define the property to aggregate;
Apply filters if any; and
Click “Add billable metric”.

This billable metric is metered only, meaning it cannot be recurring, and the number of billing units resets to 0 at the end of each period.

    LAGO_URL="https://api.getlago.com"
    API_KEY="__YOUR_API_KEY__"

    curl --location --request POST "$LAGO_URL/api/v1/billable_metrics" \
    --header "Authorization: Bearer $API_KEY" \
    --header 'Content-Type: application/json' \
    --data-raw '{
        "billable_metric": {
        "name": "API Request",
        "code": "api_requests",
        "description": "Number of API requests.",
        "aggregation_type": "latest_agg",
        "field_name": "total_requests"
    }
}'

Calculation example

Lago calculates the LAST_VALUE(events.properties.property_name) OVER (ORDER BY events.timestamp) for the two following events received.

//Event received #1
{
    "transaction_id": "transaction_1",
    "external_subscription_id": "sub_1234",
    "timestamp": "2022-03-16T00:00:00Z",
    "code": "api_requests",
    "properties": {
        "total_requests": 20
    }
}

//Event received #2
{
    "transaction_id": "transaction_2",
    "external_subscription_id": "sub_1234",
    "timestamp": "2022-03-17T00:00:00Z",
    "code": "api_requests",
    "properties": {
        "total_requests": 10
    }
}

In that case, with this aggregation type, Lago takes the latest value of the total_requests property from all events, resulting in a billable value of 10 units.

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LATEST billable metric

Calculation example

​LATEST billable metric

​Calculation example

LATEST billable metric

Calculation example