Change log for PULSE_SECURE_VPN

Date	Changes
2024-02-26	Enhancement: - Added a "kv" block to parse key-value data. - Mapped "username" to "target.user.userid". - Added conditional check for "message_info". - Mapped "u_prin_ip" to "principal.ip". - Mapped "u_observer_ip" to "observer.ip".
2023-11-07	Bug-fix: - Modified mapping for "observer_host" from "observer.hostname" to "additional.fields".
2023-08-19	Enhancement: - Added a Grok pattern to parse failing logs.
2023-05-26	Enhancement: - Added a Grok pattern to support the new syslog logs.
2023-01-06	Enhancement: - Modified grok to parse "product_type" and mapped to "metadata.product_event_type".
2022-10-25	Enhancement: - Added new grok patterns for "message_info" to extract session_id. - Mapped "session_id" to "network.session_id". - Changed target.ip to principal.ip when detect_policy_change_failed is false. - Changed target.mac to principal.mac when detect_policy_change_failed is false.
2022-10-12	Enhancement- Added mappings for following fields: - Extracted the value of IP from "msg" field and mapped it to "principal.ip". - Extracted the value of hostname from "msg" field and mapped it to "principal.hostname". - Mapped "user" to "target.user.userid". - Mapped "realm" to "principal.group.attribute.labels". - Mapped "roles" to "principal.user.group_identifiers". - Modified value for "metadata.event_type" from "GENERIC_EVENT" to "USER_UNCATEGORIZED".
2022-10-03	Enhancement- Parsed the logs containing "sudo" and parsed them. Added Support for new Key-Value Pair type log formats.
2022-07-01	Enhancement- Generated new event for EventID: 4624 Changed metadata.event_type form "GENERIC_EVENT" to "STATUS_UPDATE" or "NETWORK_CONNECTION" where "principal.ip" or "target.ip" or "principal.hostname" are not null.
2022-04-13	Enhancement-Added mappings for new fields in GENERIC_EVENT event_type: - user_ip to event.idm.read_only_udm.principal.ip. - user_group_identifier to event.idm.read_only_udm.target.user.group_identifiers. Modified timestamp in all the event_type to include timezone. Modified field user_ip, target_ip for GENERIC and NETWORK_CONNECTION event types.