Trace API calls on Kong Community Edition

We have a service pointing to the backend in the Kong API Gateway. And each service has multiple routes associated with it. Each Routes are protected with API Key using Key Authentication plugin and every route has separate Consumer associated with it

I would like to trace number of calls per Route using the API keys, how is it possible with Kong Community Edition? Or is there any other way to trace number of calls?

You can use rate-limiting plugin to rate-limit your requests if that is why you wish to count the number of API calls.

If you would like to keep track of the count, it should be possible to do so using a custom plugin.
You could also consider using Datadog or stasd or other metrics plugins to send stats to an external system where you can keep track of your API call counts.