thrift proxy: add stats to the router filter

[rgs1]

This adds stats for missing route, missing cluster, no healthy hosts,
etc. Should be useful to protect operators against bad config pushes,
plus gives more visibility.

Signed-off-by: Raul Gutierrez Segales rgs@pinterest.com

[rgs1]

failure seems unrelated:

//test/server:server_fuzz_test                                           FAILED in 81.3s
  /build/tmp/_bazel_bazel/b570b5ccd0454dc9af9f65ab1833764d/execroot/envoy/bazel-out/k8-dbg/testlogs/test/server/server_fuzz_test/test.log

Test log:

[2019-12-03 17:57:00.785][17][info][upstream] [source/common/upstream/cluster_manager_impl.cc:167] cm init: all clusters initialized
/opt/llvm/bin/../include/c++/v1/chrono:888:59: runtime error: signed integer overflow: 12135157018181088 * 1000 cannot be represented in type 'long long'
    #0 0x15863ea8 in std::__1::chrono::__duration_cast<std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >, std::__1::chrono::duration<long long, std::__1::ratio<1l,
 1000000l> >, std::__1::ratio<1000l, 1l>, false, true>::operator()(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> > const&) const /opt/llvm/bin/../include/c++/v1/
chrono:888:59
    #1 0x15863c12 in std::__1::enable_if<__is_duration<std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > >::value, std::__1::chrono::duration<long long, std::__
1::ratio<1l, 1000000l> > >::type std::__1::chrono::duration_cast<std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> >, long long, std::__1::ratio<1l, 1000l> >(std:
:__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> > const&) /opt/llvm/bin/../include/c++/v1/chrono:915:12
    #2 0x158639dc in std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> >::duration<long long, std::__1::ratio<1l, 1000l> >(std::__1::chrono::duration<long long, s
td::__1::ratio<1l, 1000l> > const&, std::__1::enable_if<(__no_overflow<std::__1::ratio<1l, 1000l>, std::__1::ratio<1l, 1000000l> >::value) && ((std::__1::integral_constant<bool, fa
lse>::value) || (((__no_overflow<std::__1::ratio<1l, 1000l>, std::__1::ratio<1l, 1000000l> >::type::den) == (1)) && (!(treat_as_floating_point<long long>::value)))), void>::type*) 
/opt/llvm/bin/../include/c++/v1/chrono:1063:26
    #3 0x22f3d22e in Envoy::Event::TimerImpl::enableTimer(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> > const&, Envoy::ScopeTrackedObject const*) /proc/self/cw
d/source/common/event/timer_impl.cc:41:17
    #4 0x1daa5e3e in Envoy::Upstream::HealthCheckerImplBase::ActiveHealthCheckSession::handleFailure(envoy::data::core::v2alpha::HealthCheckFailureType) /proc/self/cwd/source/commo
n/upstream/health_checker_base_impl.cc:351:22
    #5 0x1da37146 in Envoy::Upstream::TcpHealthCheckerImpl::TcpActiveHealthCheckSession::onEvent(Envoy::Network::ConnectionEvent) /proc/self/cwd/source/common/upstream/health_check
er_impl.cc:441:7
    #6 0x1da5f6d8 in Envoy::Upstream::TcpHealthCheckerImpl::TcpSessionCallbacks::onEvent(Envoy::Network::ConnectionEvent) /proc/self/cwd/bazel-out/k8-dbg/bin/source/common/upstream
/_virtual_includes/health_checker_lib/common/upstream/health_checker_impl.h:228:69
    #7 0x21cb0b07 in Envoy::Network::ConnectionImplBase::raiseConnectionEvent(Envoy::Network::ConnectionEvent) /proc/self/cwd/source/common/network/connection_impl_base.cc:37:15
    #8 0x21c67736 in Envoy::Network::ConnectionImpl::raiseEvent(Envoy::Network::ConnectionEvent) /proc/self/cwd/source/common/network/connection_impl.cc:332:23
....

[rgs1]

cc: @oschaaf for the above failure

[zuercher]

Thanks! I have thing to think about, but otherwise looks good.