The Timeseries Insights API is a fully-managed solution, integrated with Google Cloud services. You can create datasets with tens of billions of events, and query the dataset thousands of times per second.
For details, see the Timeseries Insights API documentation.
Train a Tabular forecasting model
As another forecasting option, you can build your own model to forecast based on structured time series data using Vertex AI Tabular forecasting.
For more information, see Tabular forecasting.