[gdebug] Maintained? Unable to get it working

Is this PoC tool for ChannelZ maintained?
If not, is there an alternative client for ChannelZ?

I think I had used this tool previously and was able to get it to work. So, this is likely my error.

Trying again to use it today with a new solution, I'm unable to do so. I'm not seeing any servers, channels etc. logged to the UI:



There are no obvious errors logged (see end).

I'm uncertain how I may go about debugging the issue.

I have a working gRPC client and server (`:50051`).

The server includes:
```Golang
service.RegisterChannelzServiceToServer(grpcServer)
```

`go.mod` includes:
```
google.golang.org/grpc v1.23.0
```

I munged around slightly with the `docker-compose.yaml` but think it remains correct. I exposed the Envoy admin port and it appears to be working correctly.

Logs:
```
envoy | + '[' 5 -ne 5 ']'
envoy | ++ mktemp --suffix=.yaml
envoy | + TEMP=/tmp/tmp.Tj2sOorGEg.yaml
envoy | + trap finish EXIT
envoy | + readonly LOCAL_PORT=9900
envoy | + LOCAL_PORT=9900
envoy | + readonly GRPC_ADDR=127.0.0.1
envoy | + GRPC_ADDR=127.0.0.1
envoy | + readonly GRPC_PORT=50051
envoy | + GRPC_PORT=50051
envoy | + readonly ASSETS_ADDR=web
envoy | + ASSETS_ADDR=web
envoy | + readonly ASSETS_PORT=8080
envoy | + ASSETS_PORT=8080
envoy | + readonly GDEBUG_TOKEN_NAME=gdebug-xsrf-token
envoy | + GDEBUG_TOKEN_NAME=gdebug-xsrf-token
envoy | + cat
envoy | + /usr/local/bin/envoy --v2-config-only -c /tmp/tmp.Tj2sOorGEg.yaml
envoy | [2019-08-19 20:31:31.217][12][info][main] source/server/server.cc:183] initializing epoch 0 (hot restart version=10.200.16384.127.options=capacity=16384, num_slots=8209 hash=228984379728933363 size=2654312)
envoy | [2019-08-19 20:31:31.217][12][info][main] source/server/server.cc:185] statically linked extensions:
envoy | [2019-08-19 20:31:31.217][12][info][main] source/server/server.cc:187] access_loggers: envoy.file_access_log,envoy.http_grpc_access_log
envoy | [2019-08-19 20:31:31.217][12][info][main] source/server/server.cc:190] filters.http: envoy.buffer,envoy.cors,envoy.ext_authz,envoy.fault,envoy.filters.http.header_to_metadata,envoy.filters.http.jwt_authn,envoy.filters.http.rbac,envoy.grpc_http1_bridge,envoy.grpc_json_transcoder,envoy.grpc_web,envoy.gzip,envoy.health_check,envoy.http_dynamo_filter,envoy.ip_tagging,envoy.lua,envoy.rate_limit,envoy.router,envoy.squash
envoy | [2019-08-19 20:31:31.217][12][info][main] source/server/server.cc:193] filters.listener: envoy.listener.original_dst,envoy.listener.proxy_protocol,envoy.listener.tls_inspector
envoy | [2019-08-19 20:31:31.217][12][info][main] source/server/server.cc:196] filters.network: envoy.client_ssl_auth,envoy.echo,envoy.ext_authz,envoy.filters.network.thrift_proxy,envoy.http_connection_manager,envoy.mongo_proxy,envoy.ratelimit,envoy.redis_proxy,envoy.tcp_proxy
envoy | [2019-08-19 20:31:31.217][12][info][main] source/server/server.cc:198] stat_sinks: envoy.dog_statsd,envoy.metrics_service,envoy.statsd
envoy | [2019-08-19 20:31:31.217][12][info][main] source/server/server.cc:200] tracers: envoy.dynamic.ot,envoy.lightstep,envoy.zipkin
envoy | [2019-08-19 20:31:31.217][12][info][main] source/server/server.cc:203] transport_sockets.downstream: envoy.transport_sockets.capture,raw_buffer,tls
envoy | [2019-08-19 20:31:31.217][12][info][main] source/server/server.cc:206] transport_sockets.upstream: envoy.transport_sockets.capture,raw_buffer,tls
envoy | [2019-08-19 20:31:31.220][12][info][config] source/server/configuration_impl.cc:50] loading 0 static secret(s)
envoy | [2019-08-19 20:31:31.221][12][info][config] source/server/configuration_impl.cc:60] loading 1 listener(s)
envoy | [2019-08-19 20:31:31.223][12][info][lua] source/extensions/filters/http/lua/lua_filter.cc:423] envoy_on_response() function not found. Lua filter will not hook responses.
envoy | [2019-08-19 20:31:31.223][12][info][config] source/server/configuration_impl.cc:94] loading tracing configuration
envoy | [2019-08-19 20:31:31.223][12][info][config] source/server/configuration_impl.cc:116] loading stats sink configuration
envoy | [2019-08-19 20:31:31.223][12][info][main] source/server/server.cc:398] starting main dispatch loop
envoy | [2019-08-19 20:31:31.230][12][info][upstream] source/common/upstream/cluster_manager_impl.cc:132] cm init: all clusters initialized
envoy | [2019-08-19 20:31:31.230][12][info][main] source/server/server.cc:378] all clusters initialized. initializing init manager
envoy | [2019-08-19 20:31:31.230][12][info][config] source/server/listener_manager_impl.cc:781] all dependencies initialized. starting workers
web | Starting static assets server on port 8080 . Note this is not the envoy port!
web | You should not need to look at this port unless you know what you're doing.
envoy | [2019-08-19T20:31:48.702Z] "GET /dist_channelz/channelz/servers HTTP/1.1" 304 - 0 0 3 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "c08cd22e-21f0-4e33-857e-e334184a1c6d" "localhost:9900" "172.23.0.3:8080"
web | Got request /dist_channelz/channelz/servers
web | Got request /dist_channelz/runtime.js
web | Got request /dist_channelz/polyfills.js
web | Got request /dist_channelz/styles.js
web | Got request /dist_channelz/scripts.js
web | Got request /dist_channelz/vendor.js
web | Got request /dist_channelz/main.js
web | Got request /favicon.ico
web | Got request /dist_channelz/channelz/servers
web | Got request /favicon.ico
envoy | [2019-08-19T20:31:48.727Z] "GET /dist_channelz/runtime.js HTTP/1.1" 304 - 0 0 0 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "0a01d469-b676-49d0-9709-5c5b5019e03b" "localhost:9900" "172.23.0.3:8080"
envoy | [2019-08-19T20:31:48.728Z] "GET /dist_channelz/polyfills.js HTTP/1.1" 304 - 0 0 0 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "a4de06cd-c950-493f-b8a2-4cc4ca48c68a" "localhost:9900" "172.23.0.3:8080"
envoy | [2019-08-19T20:31:48.729Z] "GET /dist_channelz/styles.js HTTP/1.1" 304 - 0 0 0 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "39d6a2f0-e201-48e5-83da-ffef7cc038d4" "localhost:9900" "172.23.0.3:8080"
envoy | [2019-08-19T20:31:48.730Z] "GET /dist_channelz/scripts.js HTTP/1.1" 304 - 0 0 0 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "ada191f6-c3bd-4196-8c6f-c475e943faa9" "localhost:9900" "172.23.0.3:8080"
envoy | [2019-08-19T20:31:48.731Z] "GET /dist_channelz/vendor.js HTTP/1.1" 304 - 0 0 0 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "404b0fd3-8153-498f-a0e6-7117db158f7b" "localhost:9900" "172.23.0.3:8080"
envoy | [2019-08-19T20:31:48.731Z] "GET /dist_channelz/main.js HTTP/1.1" 304 - 0 0 0 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "8079a788-efae-4698-aa50-ca6e2627df69" "localhost:9900" "172.23.0.3:8080"
envoy | [2019-08-19T20:31:49.217Z] "POST /grpc.channelz.v1.Channelz/GetServers HTTP/1.1" 200 UF 5 0 0 - "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "7a84edba-b661-4567-a71f-44f631310502" "localhost:9900" "127.0.0.1:50051"
envoy | [2019-08-19T20:31:49.216Z] "POST /grpc.channelz.v1.Channelz/GetServers HTTP/1.1" 200 UF 5 0 0 - "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "5a816286-ae94-489c-9763-197a7842130d" "localhost:9900" "127.0.0.1:50051"
envoy | [2019-08-19T20:31:49.231Z] "GET /favicon.ico HTTP/1.1" 200 - 0 588 2 2 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "76585119-2468-41e4-9aab-44565d1200d0" "localhost:9900" "172.23.0.3:8080"
envoy | [2019-08-19T20:31:51.551Z] "GET /dist_channelz/channelz/servers HTTP/1.1" 304 - 0 0 0 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "cd266d39-182c-431b-892c-8eb95ec5b98d" "localhost:9900" "172.23.0.3:8080"
envoy | [2019-08-19T20:31:51.925Z] "POST /grpc.channelz.v1.Channelz/GetServers HTTP/1.1" 200 UF 5 0 0 - "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "de719056-83f3-454c-a87a-76daae2a827a" "localhost:9900" "127.0.0.1:50051"
envoy | [2019-08-19T20:31:51.925Z] "POST /grpc.channelz.v1.Channelz/GetServers HTTP/1.1" 200 UF 5 0 0 - "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "7258f105-84ec-4a9b-877a-979e84e914d0" "localhost:9900" "127.0.0.1:50051"
envoy | [2019-08-19T20:31:51.941Z] "GET /favicon.ico HTTP/1.1" 200 - 0 588 0 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "346aa016-06f6-4842-bcdc-9740211406f8" "localhost:9900" "172.23.0.3:8080"
web | Got request /dist_channelz/channelz/servers
envoy | [2019-08-19T20:32:02.482Z] "POST /grpc.channelz.v1.Channelz/GetTopChannels HTTP/1.1" 200 UF 5 0 0 - "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "ce839ee3-4718-45ac-9a40-403a79bdc0d6" "localhost:9900" "127.0.0.1:50051"
envoy | [2019-08-19T20:32:02.482Z] "POST /grpc.channelz.v1.Channelz/GetTopChannels HTTP/1.1" 200 UF 5 0 0 - "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "b6e2bcf1-63d6-4a46-a101-83e3021bd165" "localhost:9900" "127.0.0.1:50051"
envoy | [2019-08-19T20:32:04.048Z] "POST /grpc.channelz.v1.Channelz/GetServerSockets HTTP/1.1" 200 UF 5 0 0 - "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "bbb2616f-a128-4716-992d-04a6d2e1ef52" "localhost:9900" "127.0.0.1:50051"
envoy | [2019-08-19T20:32:04.049Z] "POST /grpc.channelz.v1.Channelz/GetServerSockets HTTP/1.1" 200 UF 5 0 0 - "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "dd735949-e9cd-456f-81c0-9b7ba81949bd" "localhost:9900" "127.0.0.1:50051"
envoy | [2019-08-19T20:32:05.150Z] "POST /grpc.channelz.v1.Channelz/GetServers HTTP/1.1" 200 UF 5 0 0 - "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "7080a59d-eae2-4630-8e89-91c84080946e" "localhost:9900" "127.0.0.1:50051"
envoy | [2019-08-19T20:32:05.151Z] "POST /grpc.channelz.v1.Channelz/GetServers HTTP/1.1" 200 UF 5 0 0 - "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "f57e7a5d-aad4-471a-861a-f759fa111c26" "localhost:9900" "127.0.0.1:50051"
envoy | [2019-08-19T20:32:08.358Z] "GET /dist_channelz/channelz/servers HTTP/1.1" 304 - 0 0 0 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "71d60795-47a3-429e-bcc8-0fbdbad897bb" "localhost:9900" "172.23.0.3:8080"
web | Got request /favicon.ico
envoy | [2019-08-19T20:32:08.830Z] "POST /grpc.channelz.v1.Channelz/GetServers HTTP/1.1" 200 UF 5 0 0 - "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "fb7eb08a-b896-42bb-8b98-3a4fc542426d" "localhost:9900" "127.0.0.1:50051"
envoy | [2019-08-19T20:32:08.829Z] "POST /grpc.channelz.v1.Channelz/GetServers HTTP/1.1" 200 UF 5 0 0 - "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "d0a9e6ce-4e86-410c-9357-63aa09c14214" "localhost:9900" "127.0.0.1:50051"
envoy | [2019-08-19T20:32:08.865Z] "GET /favicon.ico HTTP/1.1" 200 - 0 588 0 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) snap Chromium/76.0.3809.100 Chrome/76.0.3809.100 Safari/537.36" "2874764c-3fe5-4ec7-939c-3d7277d31ac6" "localhost:9900" "172.23.0.3:8080"
```