Public/Get-DattoApiRateLimit.ps1

function Get-DattoApiRateLimit {
<#
.SYNOPSIS
Returns the last observed Datto API rate-limit telemetry.
.DESCRIPTION
Returns values captured from X-API-Limit-Remaining, X-API-Limit-Resets, and X-API-Limit-Cost response headers for a connection. Values remain null until a response supplies the headers.
.PARAMETER Connection
A connection object, name, or ID. The default connection is used when omitted.
.EXAMPLE
Get-DattoApiRateLimit
.OUTPUTS
DattoBackupApi.RateLimit
#>

    [CmdletBinding()]
    param(
        [Parameter(ValueFromPipeline)]
        [AllowNull()]
        [object]$Connection
    )
    process {
        $state = Resolve-DattoApiConnectionState -Connection $Connection
        $result = [pscustomobject][ordered]@{
            ConnectionId   = [guid]$state.Id
            ConnectionName = [string]$state.Name
            Remaining      = $state.RateLimit.Remaining
            ResetEpoch     = $state.RateLimit.ResetEpoch
            ResetAtUtc     = $state.RateLimit.ResetAtUtc
            Cost           = $state.RateLimit.Cost
            ObservedAtUtc  = $state.RateLimit.ObservedAtUtc
        }
        $result.PSObject.TypeNames.Insert(0, 'DattoBackupApi.RateLimit')
        $result
    }
}