I am new to splunk. Is there any way to know whether an index got rolled to frozen because of frozen time period or maxTotalDataSizeMB so that we can troubleshoot for missing data.
Those parameters are defined in indexes.conf. If you have not set them explicitly, then the default values are assumed.
You can see the state of all buckets in your index, as well as other useful information with "dbinspect".
Run this from the search bar:
| dbinspect index=your_index_name_here