You may not be able to see the charts for the tracker metrics if the tracker initial load is not running correctly.
The incremental data collection is disabled until the initial load is run. You can check if the initial load is completed successfully by executing the query below from the Ad-hoc reporting page against the datamart.
select status from etl_job where job_name='tracker_initial_etl';
You must get the status value as 1 if the initial load is completed successfully. Otherwise, you must trigger the job manually by executing the command: [RUNTIME_DIR]/scripts/etl-client.py -r TrackerInitialJob