Change log for IMPERVA_DB

Date Changes
2025-02-19 Enhancement:
- Added support to parse new logs with SYSLOG+JSON format.
2024-04-09 Enhancement:
- Added gsubs to handle invalid JSON characters in logs.
- Mapped raw-query to security_result.detection_fields.
2024-01-21 Enhancement:
- Added a new Grok pattern to parse unparsed logs of format SYSLOG+JSON.
- Mapped version to metadata.product_version.
- Mapped dest-ip to target.ip.
- Mapped dest-port to target.port.
- Mapped source-ip to principal.ip.
- Mapped source-port to principal.port.
- Mapped db-user to principal.user.userid.
- Mapped os-user to principal.user.userid.
- Mapped protocol to network.ip_protocol.
- Mapped audit-policy to security_result.category_details.
- Mapped server-group, service-name, user-group, raw-query, parsed-query, bind-variables, sql-error, db-schema-pair.db-name, db-schema-pair.schema-name, and objects-list to additional.fields.
- Mapped application-name to target.application.
- Mapped source-application to principal.application.
- Mapped event-id to metadata.product_log_id.
- Mapped event-type to metadata.product_event_type.
- Mapped application-user to principal.user.user_display_name.
- Mapped host-name to principal.hostname.
- Mapped mx-ip, gw-ip to intermediary.ip.
- Mapped policy-id and user-authenticated to security_result.detection_fields.
- If has_principal is true and has_target is true, then set metadata.event_type as NETWORK_CONNECTION.
- If has_principal is true, then set metadata.event_type as STATUS_UPDATE.
2023-07-17 Bug-Fix
- Parsed unparsed raw logs using Grok patterns and kv filters.
- Mapped srcPort to principal.port.
- Mapped srcIP to principal.ip.
- Mapped dstIP to target.ip.
- Mapped dstPort to target.port.
- Mapped alertSev to security_result.severity.
- Mapped ruleName to security_result.rule_name.
- Mapped category to security_result.category.
- Mapped group to target.user.group_identifiers.
- Mapped dbName to target.resource.name.
- Mapped policyName to security_result.detection_fields.
- Mapped username to principal.user.user_display_name.
- Mapped evntDesc to security_result.description.
- Mapped action to security_result.action_details.
2023-02-03 Enhancement
- Mapped event_name to metadata.product_event_type.