Update google_travel_time.markdown (#17720)

Updating documentation with regards to feedback received on #17717 
Removed references to scan-interval as this functionality has been deprecated.
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d3wy 2021-05-06 23:45:16 +10:00 committed by GitHub
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@ -17,7 +17,7 @@ The `google_travel_time` sensor provides travel time from the [Google Distance M
You need to register for an API key by following the instructions [here](https://github.com/googlemaps/google-maps-services-python#api-keys). You only need to turn on the Distance Matrix API.
[Google now requires billing](https://mapsplatform.googleblog.com/2018/05/introducing-google-maps-platform.html) to be enabled (and a valid credit card loaded) to access Google Maps APIs. The Distance Matrix API is billed at US$10 per 1000 requests, however, a US$200 per month credit is applied (20,000 requests). By default, the sensor will update the travel time every 5 minutes, making approximately 288 calls per day. Note that at this rate, more than 2 sensors will likely exceed the free credit amount. If you need to run more than 2 sensors, consider changing the [scan interval](/docs/configuration/platform_options/#scan-interval) to something longer than 5 minutes to stay within the free credit limit or update the sensors on-demand using an automation (see example below).
[Google now requires billing](https://mapsplatform.googleblog.com/2018/05/introducing-google-maps-platform.html) to be enabled (and a valid credit card loaded) to access Google Maps APIs. The Distance Matrix API is billed at US$10 per 1000 requests, however, a US$200 per month credit is applied (20,000 requests). The sensor will update the travel time every 5 minutes, making approximately 288 calls per day. Note that at this rate, more than 2 sensors will likely exceed the free credit amount. While this call frequency can not be decreased, you may have a use case which requires the data to be updated more often, to do this you may update on-demand (see automation example below).
A quota can be set against the API to avoid exceeding the free credit amount. Set the 'Elements per day' to a limit of 645 or less. Details on how to configure a quota can be found [here](https://developers.google.com/maps/documentation/distance-matrix/usage-and-billing#set-caps)