In short: No, there is no limit to the number of metrics that can be sent to Proficloud.io and the Time Series Data Service.
The subscriptions that can be booked for the Time Series Data Service range from 50 metrics in the smallest package to 1500 metrics in the largest package. If you want to send more metrics to Proficloud.io and the Time Series Data Service for your company, please get in touch with us!
We will put together a customized package for you, with which you can use the required number of metrics on Proficloud.io in the Time Series Data Service.