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* add isolation level db configuration parameter * add isolation_level to default.ini and sample.ini * add note that only mysql supports isolation levels for now * mention isolation_level in the documentation * Update docs/sources/administration/configuration.md Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com> Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>