update exporter readme and default ports

Author: Tristan Sloughter

apps/opentelemetry_exporter/README.md

@@ -51,19 +51,27 @@ config :opentelemetry, :processors,
 - `otlp_endpoint`: The URL to send traces and metrics to, for traces the path `v1/traces` is appended to the path in the URL.
 - `otlp_traces_endpoint`: URL to send only traces to. This takes precedence for exporting traces and the path of the URL is kept as is, no suffix is appended.
 - `otlp_headers`: List of additional headers (`[{unicode:chardata(), unicode:chardata()}]`) to add to export requests.
-- `otlp_traces_headers`: Additional headers (`[{unicode:chardata(), unicode:chardata()}]`) to add to only trace export requests.
-    
+- `otlp_traces_headers`: Additional headers (`[{unicode:chardata(),
+  unicode:chardata()}]`) to add to only trace export requests.
+- `otlp_protocol`: The transport protocol, supported values: `grpc` and `http_protobuf`. Defaults to `http_protobuf`.
+- `otlp_traces_protocol`: The transport protocol to use for exporting traces, supported values: `grpc` and `http_protobuf`. Defaults to `http_protobuf`.
+- `otlp_compression`: Compression type to use, supported values: `gzip`. Defaults to no compression.
+- `otlp_traces_compression`: Compression type to use for exporting traces, supported values: `gzip`. Defaults to no compression.
 
 ``` erlang
 {opentelemetry_exporter,
-  [{otlp_endpoint, "https://api.honeycomb.io:443"},
+  [{otlp_protocol, grpc},
+   {otlp_compression, gzip},
+   {otlp_endpoint, "https://api.honeycomb.io:443"},
    {otlp_headers, [{"x-honeycomb-dataset", "experiments"}]}]}
 ```
 
 An Elixir release uses `releases.exs`:
 
 ``` elixir
 config :opentelemetry_exporter,
+  otlp_protocol: :grpc,
+  otlp_compression: :gzip,
   otlp_endpoint: "https://api.honeycomb.io:443",
   otlp_headers: [{"x-honeycomb-dataset", "experiments"}]
 ```
@@ -87,11 +95,16 @@ for more information on securing HTTP requests in Erlang.
 - `OTEL_EXPORTER_OTLP_TRACES_ENDPOINT`: URL to send only traces to. This takes precedence for exporting traces and the path of the URL is kept as is, no suffix is appended.
 - `OTEL_EXPORTER_OTLP_HEADERS`: List of additional headers to add to export requests.
 - `OTEL_EXPORTER_OTLP_TRACES_HEADERS`: Additional headers to add to only trace export requests.
+- `OTEL_EXPORTER_OTLP_PROTOCOL`: The transport protocol to use, supported values: `grpc` and `http_protobuf`. Defaults to `http_protobuf`
+- `OTEL_EXPORTER_OTLP_TRACES_PROTOCOL`: The transport protocol to use for exporting traces, supported values: `grpc` and `http_protobuf`. Defaults to `http_protobuf`.
+- `OTEL_EXPORTER_OTLP_COMPRESSION`: Compression to use, supported value: gzip. Defaults to no compression.
+- `OTEL_EXPORTER_OTLP_TRACES_COMPRESSION`: Compression to use when exporting traces, supported value: gzip. Defaults to no compression.
 
 Example usage of setting the environment variables:
 ```
 OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=https://api.honeycomb.io:443
-OTEL_EXPORTER_OTLP_PROTOCOL=grpc
+OTEL_EXPORTER_OTLP_TRACES_PROTOCOL=grpc
+OTEL_EXPORTER_OTLP_TRACES_COMPRESSION=gzip
 OTEL_EXPORTER_OTLP_TRACES_HEADERS=x-honeycomb-team=<HONEYCOMB API TOKEN>,x-honeycomb-dataset=experiments
 ```
 

apps/opentelemetry_exporter/src/opentelemetry_exporter.erl

@@ -93,9 +93,9 @@
 
 -define(DEFAULT_ENDPOINTS, [#{host => "localhost",
                               path => [],
-                              port => 4317,
-                              scheme => "https"}]).
--define(DEFAULT_PORT, 4317).
+                              port => 4318,
+                              scheme => "http"}]).
+-define(DEFAULT_PORT, 4318).
 -define(DEFAULT_TRACES_PATH, "v1/traces").
 
 -type headers() :: [{unicode:chardata(), unicode:chardata()}].

apps/opentelemetry_exporter/test/opentelemetry_exporter_SUITE.erl

@@ -77,7 +77,7 @@ configuration(_Config) ->
         ?assertMatch([#{scheme := "https", host := "localhost", port := 443, path := "/used/path"}],
                      opentelemetry_exporter:endpoints(<<"https://localhost:443/used/path">>, [])),
 
-        ?assertMatch([#{scheme := "http", host := "localhost", port := 4317, path := []}],
+        ?assertMatch([#{scheme := "http", host := "localhost", port := 4318, path := []}],
                      opentelemetry_exporter:endpoints("http://localhost", [])),
 
         ?assertMatch([], opentelemetry_exporter:endpoints("://badendpoint", [])),
@@ -243,7 +243,7 @@ verify_export(Config) ->
                grpc ->
                    4317;
                http_protobuf ->
-                   55681
+                   4318
            end,
     {ok, State} = opentelemetry_exporter:init(#{protocol => Protocol,
                                                 compression => Compression,

config/otel-collector-config.yaml

@@ -5,7 +5,7 @@ receivers:
       grpc:
         endpoint: "0.0.0.0:4317"
       http:
-        endpoint: "0.0.0.0:55681"
+        endpoint: "0.0.0.0:4318"
 processors:
   batch:
     send_batch_size: 1024

docker-compose.yml

@@ -5,8 +5,8 @@ services:
     command: ["--config=/conf/otel-collector-config.yaml"]
     privileged: true
     ports:
-      - 55681:55681
       - 4317:4317
+      - 4318:4318
     volumes:
       - ./config/otel-collector-config.yaml:/conf/otel-collector-config.yaml
     links: