Custom attributes and spans for FeatureFlag service

CHANGELOG.md

@@ -93,3 +93,5 @@ significant modifications will be credited to OpenTelemetry Authors.
 ([#345](https://github.com/open-telemetry/opentelemetry-demo/pull/345))
 * Improve initial run time, without a build
 ([#362](https://github.com/open-telemetry/opentelemetry-demo/pull/362))
+* Add custom span and custom span attributes for Feature Flag Service
+([#371](https://github.com/open-telemetry/opentelemetry-demo/pull/371))

docs/manual_span_attributes.md

@@ -51,8 +51,10 @@ This document contains the list of manual Span Attributes used throughout the de
 ## FeatureFlagService
 
 | Name      | Type | Description |
-|-----------|------|-------------|
-| None yet  |      |             |
+|-------------------------------|---------|--------------------------|
+| `app.featureflag.name`        | string  | Name of the feature flag |
+| `app.featureflag.description` | string  | Admin description        |
+| `app.featureflag.enabled`     | boolean | The feature flag status  |             |
 
 ## Frontend
 

docs/trace_service_features.md

@@ -13,7 +13,7 @@ Emoji Legend
 | Checkout        | Go              | :100:                     | :100:                | :100:                | :no_bell:               | :no_bell:  | :no_bell: |
 | Currency        | C++             | :no_bell:                 | :100:                | :100:                | :100:                   | :no_bell:  | :no_bell: |
 | Email           | Ruby            | :100:                     | :100:                | :100:                | :no_bell:               | :no_bell:  | :no_bell: |
-| Feature Flag    | Erlang / Elixir | :100:                     | :construction:       | :construction:       | :no_bell:               | :no_bell:  | :no_bell: |
+| Feature Flag    | Erlang / Elixir | :100:                     | :100:                | :100:                | :no_bell:               | :no_bell:  | :no_bell: |
 | Frontend        | JavaScript      | :100:                     | :100:                | :100:                | :no_bell:               | :100:      | :100:     |
 | Payment         | JavaScript      | :100:                     | :100:                | :100:                | :no_bell:               | :no_bell:  | :100:     |
 | Product Catalog | Go              | :100:                     | :no_bell:            | :100:                | :no_bell:               | :no_bell:  | :no_bell: |

src/featureflagservice/lib/featureflagservice/feature_flags.ex

@@ -4,6 +4,9 @@ defmodule Featureflagservice.FeatureFlags do
   """
 
   import Ecto.Query, warn: false
+
+  require OpenTelemetry.Tracer
+
   alias Featureflagservice.Repo
 
   alias Featureflagservice.FeatureFlags.FeatureFlag
@@ -64,9 +67,17 @@ defmodule Featureflagservice.FeatureFlags do
 
   """
   def create_feature_flag(attrs \\ %{}) do
-    %FeatureFlag{}
-    |> FeatureFlag.changeset(attrs)
-    |> Repo.insert()
+    {function_name, arity} = __ENV__.function
+    OpenTelemetry.Tracer.with_span "featureflagservice.featureflags.#{function_name}/#{arity}" do
+      OpenTelemetry.Tracer.set_attributes(%{
+        "app.featureflag.name" => attrs["name"],
+        "app.featureflag.description" => attrs["description"],
+        "app.featureflag.enabled" => attrs["enabled"]
+      })
+      %FeatureFlag{}
+      |> FeatureFlag.changeset(attrs)
+      |> Repo.insert()
+    end
   end
 
   @doc """

src/featureflagservice/src/ffs_service.erl

@@ -10,6 +10,8 @@
 
 -include_lib("grpcbox/include/grpcbox.hrl").
 
+-include_lib("opentelemetry_api/include/otel_tracer.hrl").
+
 -spec get_flag(ctx:t(), ffs_demo_pb:get_flag_request()) ->
     {ok, ffs_demo_pb:get_flag_response(), ctx:t()} | grpcbox_stream:grpc_error_response().
 get_flag(Ctx, #{name := Name}) ->
@@ -22,6 +24,8 @@ get_flag(Ctx, #{name := Name}) ->
           inserted_at := CreatedAt,
           updated_at := UpdatedAt
          } ->
+            ?set_attribute('app.featureflag.name', Name),
+            ?set_attribute('app.featureflag.enabled', Enabled),
             {ok, Epoch} = 'Elixir.NaiveDateTime':from_erl({{1970, 1, 1}, {0, 0, 0}}),
             CreatedAtSeconds = 'Elixir.NaiveDateTime':diff(CreatedAt, Epoch),
             UpdatedAtSeconds = 'Elixir.NaiveDateTime':diff(UpdatedAt, Epoch),