Add metadata to metrics and events

Problem to solve

We would like to be able to break down metrics/logs based on client metadata.

Proposal

Client type (grpc / websockets)

• Pass x-gitlab-client-type from language server. @Joey_Khabie MR
• Forward x-gitlab-client-type header in websocket to gRPC metadata @halilcoban MR
• Add client_type to prometheus metrics @halilcoban
• Add client_type to runwway dashboard definiton @halilcoban
• Add client_type to DWS logs @shinya.maeda
• Add client_type to internal events @Joey_Khabie

Client Version (language server version, etc)

• Pass X-Gitlab-Language-Server-Version from language server.
• Forward X-Gitlab-Language-Server-Version header in websocket to gRPC metadata @halilcoban MR
• Add lsp_version to prometheus metrics @halilcoban MR
• Add lsp_version to runwway dashboard definiton @halilcoban
• Add lsp_version type to DWS logs @shinya.maeda
• Add lsp_version type to internal events @Joey_Khabie

GitLab Version

• Add gitlab_version to prometheus metrics @halilcoban
• Add gitlab_version to runwway dashboard definiton @halilcoban
• Add gitlab_version type to DWS logs @shinya.maeda
• Add gitlab_version type to internal events @Joey_Khabie

User Agent

• Pass correct user agent in Language Server @shinya.maeda MR
• Pass correct user agent in Workhorse @shinya.maeda MR
• Pass correct user agent in Go executor @shinya.maeda MR
• User agent won't be added to Prometheus metrics due to concern of cardinality.

Further details

Links / references