Add OTEL into the project

[glanham-jr]

https://github.com/open-telemetry/opentelemetry-php

Need to do a wide structured event at the end of every HTTP request send from client to server. We can start with basic metrics and work our way up from there.

PHP: SDK + API

• https://opentelemetry.io/docs/languages/php/

We need to install API, Context, SDK, and some exporter.

• API
• Context
• SDK
• Exporter OTLP - seems to be the most popular exporter
• Gen OTLP Protobuf - may be required for using GRPC + Protobuf, not yet sure

ONLY depend on classes/interfaces from API package.

We will likely want to install the following optional dependencies

• GRPC - https://github.com/grpc/grpc/tree/master/src/php
• Protobuf - https://github.com/protocolbuffers/protobuf/tree/main/php

Collector

A dedicated process that takes in OTEL data and shoves it somewhere else (eventually SigNoz). Will be a separate Docker for this

• https://opentelemetry.io/docs/collector/quick-start/

Signoz

• https://signoz.io/docs/install/docker/#install-signoz-using-docker-compose

Specification

• https://opentelemetry.io/docs/specs/otel/

[glanham-jr]

Relates to the below

#118