Calculate downtime for bgpevent

[stveit]

Scope and purpose

Fixes #368 .

Contributor Checklist

Every pull request should have this checklist filled out, no matter how small it is.
More information about contributing to Zino can be found in the
README.

• Added a changelog fragment for towncrier
• Added/amended tests for new/changed code
• Added/changed documentation
• Linted/formatted the code with black, ruff and isort, easiest by using pre-commit
• The first line of the commit message continues the sentence "If applied, this commit will ...", starts with a capital letter, does not end with punctuation and is 50 characters or less long. See https://cbea.ms/git-commit/
• If applicable: Created new issues if this PR does not fix the issue completely/there is further work to be done

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	black	2		0	0.62s
✅ PYTHON	isort	2		0	0.2s
✅ PYTHON	ruff	2		0	0.01s

See detailed report in MegaLinter reports
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff

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[github-actions]

Test results

    3 files      3 suites   1m 28s ⏱️
  594 tests   594 ✅ 0 💤 0 ❌
1 734 runs  1 732 ✅ 2 💤 0 ❌

Results for commit 1cee2be.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.66%. Comparing base (949fc84) to head (1cee2be).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #369   +/-   ##
=======================================
  Coverage   98.66%   98.66%           
=======================================
  Files          77       77           
  Lines        9709     9711    +2     
=======================================
+ Hits         9579     9581    +2     
  Misses        130      130           

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud