[metrics-bugs] #24260 [Metrics/Website]: Add metrics timeline events underneath graphs

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#24260: Add metrics timeline events underneath graphs
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 Reporter:  karsten                   |          Owner:  metrics-team
     Type:  enhancement               |         Status:  needs_review
 Priority:  Medium                    |      Milestone:
Component:  Metrics/Website           |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  ux-team metrics-timeline  |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by iwakeh):

 As with #24580 it might be good to introduce java 8 date time classes
 throughout the touched/created code, avoiding to use string comparison
 when actually comparing dates, which could fail when changing date
 formats.  This concerns mostly GraphServlet, MetricsServlet, and News.
 Should at least be a new (higher prio) ticket.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24260#comment:14>
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