[metrics-bugs] #28003 [Metrics/CollecTor]: Consider refactoring various code that makes descriptors persistent

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#28003: Consider refactoring various code that makes descriptors persistent
-----------------------------------+--------------------------
     Reporter:  karsten            |      Owner:  metrics-team
         Type:  enhancement        |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Metrics/CollecTor  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:                     |   Reviewer:
      Sponsor:                     |
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 From #27390:

 ''"How much does the new function in PersistenceUtils differ from the
 similar functions:''

 {{{
 onionperf/OnionPerfDownloader.java:  public void cleanUpRsyncDirectory()
 throws ConfigurationException {
 exitlists/ExitListDownloader.java:  public void cleanUpRsyncDirectory() {
 bridgedescs/SanitizedBridgesWriter.java:  public void
 cleanUpRsyncDirectory() throws ConfigurationException {
 relaydescs/ArchiveWriter.java:  public void cleanUpRsyncDirectory() {
 }}}

 ''Currently webstats does seem to be the only module that uses the shared
 function. The relaydescs module may need something more complex to handle
 persisting microdescriptors for longer, but the other modules could maybe
 just switch? This could be a new ticket."''

 Needs discussion first.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28003>
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