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2021-08-20: rewritten for CMK 2.0 by thl-cmk[at]outlook[dot]com
based on the "BGP Peer State Check" check by Thomas Wollner (tw[at]ollner-net[dot]de),
(http://wollner-net.de/check_mk/network_checks/bgp_peer-1.4.mkp)
2021-08-21: added more perfdata, added metrics file
2021-08-22: added WATO options, streamlined with cisco_bgp_peer
2021-08-29: moved static (longoutput) to inventory plugin
moved helper functions to utils/bgp_peer
WATO: removed htmloutput and infotext_values option
2021-11-14: merged check function with cisco_bgp_peer
moved parse function to utils/bgp_peer
2022-04-02: WATO: added bgp neighbour states
rewritten bgp neighbor state handling (made configurable)
2022-04-17: added peer_unavail_reason/peer_unavail_reason_str for huawei bgp peers
2022-04-24: added peer status to inventory
added option to remove some columns from inventory
2022-04-28: added whois information to inventory
2022-04-29: added upper/lower prefix limits from wato
added info if device is admin prefix limit capable (device_admin_limit)
2022-04-30: code clenup
2022-05-02: fixed missing not_in_service_time from params
2022-05-09: made item name configurable (don't use address-family/routing-instance/VRF)
2022-05-11: changed bgp_get_peer_entry to get proper parameters instead of Nontransparent list
added remote_as to BgpPeerItem
2022-05-12: merged bgp_get_ip_address_from_oid with bgp_render_ip_address
changed IPv6 address format to lower case as required by rfc5952 section-4.3 (this affects IPv6 items)
2022-09-05: added missing wato parameters to register.check_plugin check_default_parameters
2022-09-05: added internal_item to WATO as hidden_key to avoid warnings on cmk updates (THX to Jay2k1 for reporting the issue)
2022-09-10: made more reliable on limited data (fsm_established_time and admin_state) (THX to martin[dot]pechstein[at]posteo[dot]de)
2022-09-11: optimized internal flow: > alias > not found > admin down > peer state > ...
2023-01-21: changed to always yield fsm_established_time (not only if beep connects, but also on all other states)
2023-01-20: add description to BgpPeerItem (for Arista)
2023-01-22: fix output for admin_state
2023-02-16: changed for CMK 2.1 (moved gui files from local/share/.. to local/lib/..)
fix type error in discovery (CMK2.1 GUI only)
2023-03-26: optimized output of metrics, GetRateError will not be set to 0 anymore
2023-06-11: set upper cmk version to 2.2.0b1 for bgp_peer-2.0.1-20230611.mkp
2023-06-11: moved wato file to check_parameters sub directory
removed declare_invtable_view from view definition on cmk 2.2 (see werk 15493)
2023-08-17: fix removed internal_item form check_default_parameters (THX mail[at]bastian-kuhn[dot]de)
added warning if internal_item is missing in params
2024-05-17: fixed typo in metrics file range mac -> max (crashed graphs in cmk 2.3.)