Dash0 CLI: OAuth support, OTLP proxy, and more!

Browser-based OAuth login, a local OTLP forwarder for in-loop development, precision-mode queries for exact lookups, and a one-command Homebrew install.

OAuth login: dash0 login opens your browser, completes the OAuth 2.0 + PKCE flow, and stores access/refresh tokens in your profile. Access tokens refresh transparently before expiration. Static auth_* tokens still work. dash0 config show annotates auth state showing whether a token is static, OAuth-active with remaining lifetime, or OAuth-empty. Safe by default for AI agents: dash0 login refuses to open a browser and dash0 logout requires explicit --force flag.

Local OTLP proxy: dash0 otlp proxy runs a foreground forwarder on 127.0.0.1:4318 (OTLP/HTTP) and 127.0.0.1:4317 (OTLP/gRPC) shipping telemetry to Dash0 with active profile's credentials. OpenTelemetry SDKs at default endpoint configuration connect with zero environment-variable changes. Shows telemetry transmission rates and totals. Supports resource attribute tagging for filtering telemetry on shared backends and --tail flag to watch every forwarded record.