Add OpenTelemetry dependencies for backend instrumentation

- Add core OpenTelemetry SDK and API packages
- Include automatic instrumentation for Phoenix, Ecto, Absinthe, and Cowboy
- Add OTLP exporter for sending traces to Splunk Observability Cloud
- Update Node.js version to 18 for frontend OpenTelemetry compatibility

Author: caitlinhalla

manual-instrumentation/worms_in_space/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:10-alpine AS worms-in-space-npm
+FROM node:18-alpine AS worms-in-space-npm
 WORKDIR /app/npm
 COPY ./assets/package.json /app/npm/package.json
 COPY ./assets/package-lock.json /app/npm/package-lock.json

manual-instrumentation/worms_in_space/mix.exs

@@ -46,7 +46,15 @@ defp deps do
     {:absinthe_plug, "~> 1.5"},
     {:absinthe_phoenix, "~> 2.0"},
     {:cors_plug, "~> 3.0"},
-    {:esbuild, "~> 0.8", runtime: Mix.env() == :dev}
+    {:esbuild, "~> 0.8", runtime: Mix.env() == :dev},
+    # OpenTelemetry dependencies
+    {:opentelemetry, "~> 1.3"},
+    {:opentelemetry_api, "~> 1.2"},
+    {:opentelemetry_exporter, "~> 1.6"},
+    {:opentelemetry_phoenix, "~> 1.1"},
+    {:opentelemetry_ecto, "~> 1.1"},
+    {:opentelemetry_absinthe, "~> 2.2"},
+    {:opentelemetry_cowboy, "~> 0.2"}
   ]
 end