Spanner provides JSON string versions of the following statistics

## Feature Feature Spanner provides JSON string versions of the following statistics columns for PostgreSQL-dialect databases: * `TOTAL_LATENCY_DISTRIBUTION_JSON_STRING` in[Transaction statistics](https://cloud.google.com/spanner/docs/introspection/transaction-statistics) * `OPERATIONS_BY_TABLE_JSON_STRING` in[Transaction statistics](https://cloud.google.com/spanner/docs/introspection/transaction-statistics) * `LATENCY_DISTRIBUTION_JSON_STRING` in[Query statistics](https://cloud.google.com/spanner/docs/introspection/query-statistics) * `SAMPLE_LOCK_REQUESTS_JSON_STRING` in[Lock statistics](https://cloud.google.com/spanner/docs/introspection/lock-statistics) You can use these columns to retrieve statistics in JSON format from the`SPANNER_SYS` tables.