[rancid] Junos EVO alarms have constantly updated timestamps

[Chris Wopat]

We have a PTX1k in our lab, which we got without a license. Annoyingly,
Junos EVO seems to update timestamps hourly on the `show alarms` output,
meaning there's always a diff.

Example diff in RANCID:

- # 2024-01-19 06:11:54 CST  Minor  20 Port Bandwidth Usage (in
gbps)s(279) require a license
- # 2024-01-19 06:11:54 CST  Minor  BGP Routing Protocol(47) usage
requires a license
- # 2024-01-19 06:11:54 CST  Minor  LDP Protocol(257) usage requires a license
- # 2024-01-19 06:11:54 CST  Minor  RSVP Protocol(258) usage requires a license
- # 2024-01-19 06:11:54 CST  Minor  IGMP protocol(263) usage requires a license
- # 2024-01-19 06:11:54 CST  Minor  PIM protocol(267) usage requires a license
- # 2024-01-19 06:11:54 CST  Minor  OSPF protocol(282) usage requires a license
+ # 2024-01-19 07:11:54 CST  Minor  20 Port Bandwidth Usage (in
gbps)s(279) require a license
+ # 2024-01-19 07:11:54 CST  Minor  BGP Routing Protocol(47) usage
requires a license
+ # 2024-01-19 07:11:54 CST  Minor  LDP Protocol(257) usage requires a license
+ # 2024-01-19 07:11:54 CST  Minor  RSVP Protocol(258) usage requires a license
+ # 2024-01-19 07:11:54 CST  Minor  IGMP protocol(263) usage requires a license
+ # 2024-01-19 07:11:54 CST  Minor  PIM protocol(267) usage requires a license
+ # 2024-01-19 07:11:54 CST  Minor  OSPF protocol(282) usage requires a license


For now we just filtered these fully in junos.pm ShowChassisAlarms:

    next if (/require a license|requires a license/i);

If someone can whip up a REAL patch to just filter out the timestamp part
leaving the alarm value, that'd be a better fix for all.

Cheers
Chris
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