OpenTSDB 2.5.0 RC1

What's Changed

• Fix race condition in UID lookup by @neilfordyce in #2176
• Bump Logback version to patch CVE-2021-42550 by @manolama in #2208
• Add logback 1.2.9 jar md5s by @eswdd in #2218
• Enhance range tests and regex and add better default for output validator by @eswdd in #2217
• Update some dependencies for #2262. by @manolama in #2263
• Tighten up the regexes for Gnuplot URI params per multiple by @manolama in #2272
• Improved fix for #2261. by @manolama in #2275
• Fix for #2269 and #2267 XSS vulnerability. by @manolama in #2274
• Trigger callback chain when reached limit. by @ugtar in #2204
• Use ConcurrentHashMap when serializing tags. by @bshakur8 in #2282
• Test for null, avoid NPE by @theultimatequestion in #2281
• Update opentsdb_restart.py by @ddoshy in #1515
• Revert "Update opentsdb_restart.py (#1515)" by @johann8384 in #2298

Noteworthy Changes:

• Bump Jackson to 2.14.1 WARNING: The minimum JDK is now version 8 due to Jackson. (#2263)
• Enhance range tests and regex and add better default for output validator (#2217)
• Converting to using SystemD systemctl (#1515)
• Status API, Start of a new HTTP API (#1742)
• Allow end_time = start_time to be able to query and delete a single datapoint. (#2036)
• Add support for splitting rollup queries (#1853)
• ExplicitTags filtering with FuzzyFilters (#1896)
• Add "check_tsd_v2" script (#1567)
• Do PutDataPointRpc.GroupCB asynchronously (#1472)
• Tag Normalization Plugin Support (#1525)

Bug Fixes:

• Fix race condition in UID lookup (#2176)
• Tighten up the regexes for Gnuplot URI params per multiple security reports. (#2272)
• Trigger callback chain when reached limit. (#2204, #839)
• Use ConcurrentHashMap when serializing tags. (#2282, #1055)
• Test for null, avoid NPE (#2281, #2280)
• Ensure we always add the {} for group_by filters, otherwise the non group_by filters act as group_by filters (#1697)
• Added tracking of metrics which are null due to auto_metric being disabled Fixes (#786,#2042)
• Fixed function description Fixes (#841,#2040)
• Fix concurrent result reporting from scanners (#1753)
• Fix SaltScanner race condition on spans maps (#1651)
• Fix an edge case in TsdbQuery.getScanEndTimeSeconds() (#1581, #1582)
• Fix a compilation error about missing FirstDifference (#1471)

Security Fixes:

• Bump Logback version to patch CVE-2021-42550 (#2208, #2218)
• Make sure the inputs are only plain ASCII printables first. Fixes CVE-2018-12972, CVE-2020-35476 (#2275)

New Contributors

• @ugtar made their first contribution in #2204
• @bshakur8 made their first contribution in #2282
• @theultimatequestion made their first contribution in #2281
• @ddoshy made their first contribution in #1515

** Full Changelog**: https://github.com/OpenTSDB/opentsdb/blob/master/NEWS
Full Diff: v2.4.1...v2.5.0RC1