[ANN] raindrops 0.18.0 - real-time stats for preforking Rack servers

[Eric Wong <e@80x24.org>]

raindrops is a real-time stats toolkit to show statistics for Rack HTTP
servers.  It is designed for preforking servers such as unicorn, but
should support any Rack HTTP server on platforms supporting POSIX shared
memory.  It may also be used as a generic scoreboard for sharing atomic
counters across multiple processes.

* https://bogomips.org/raindrops/
* No subscription necessary, no HTML mail:
  raindrops-public@bogomips.org
* mail archives: https://bogomips.org/raindrops-public/
  http://ou63pmih66umazou.onion/raindrops-public/
  nntp://news.public-inbox.org/inbox.comp.lang.ruby.raindrops
  nntp://ou63pmih66umazou.onion/inbox.comp.lang.ruby.raindrops
* git clone git://bogomips.org/raindrops.git
* https://bogomips.org/raindrops/NEWS.atom.xml
* Demo site: https://raindrops-demo.bogomips.org:8443/

Changes:

    raindrops 0.18.0
    
    The most notable feature of this release is the addition of
    FreeBSD and OpenBSD TCP_INFO support.  This includes the
    Raindrops::TCP for portably mapping TCP state names to
    platform-dependent numeric values:
    
      https://bogomips.org/raindrops/Raindrops.html#TCP
    
    Thanks to Jeremy Evans and Simon Eskildsen on the
    unicorn-public@bogomips.org mailing list for inspiring
    these changes to raindrops.
    
    There's also a few internal cleanups, and documentation
    improvements, including some fixes to the largely-forgotten
    Raindrops::Aggreage::PMQ class:
    
      https://bogomips.org/raindrops/Raindrops/Aggregate/PMQ.html
    
    20 changes since 0.17.0:
    
          test_inet_diag_socket: fix Fixnum deprecation warning
          TODO: add item for IPv6 breakage
          ext: fix documentation for C ext-defined classes
          TCP_Info: custom documentation for #get!
          TypedData C-API conversion
          test_watcher: disable test correctly when aggregate is missing
          tcp_info: support this struct under FreeBSD
          define Raindrops::TCP hash for TCP states
          linux_inet_diag: reduce stack usage and simplify
          avoid reading errno repeatedly
          aggregate/pmq: avoid false sharing of lock buffers
          aggregate/pmq: remove io-extra requirement
          aggregate/pmq: avoid File#stat allocation
          Merge remote-tracking branch 'origin/freebsd'
          Merge remote-tracking branch 'origin/aggregate-pmq'
          doc: remove private email support address
          doc: update location of TCP_INFO-related stuff
          build: avoid olddoc for building the RubyGem
          doc: document Raindrops::TCP hash
          aggregate/pmq: update version numbers for Ruby and Linux