curated_compose/docker/alloy/config.alloy

// =============================================================================
// Grafana Alloy Pipeline Configuration
// Centralized OpenTelemetry collector for the curated compose stacks.
// Receives OTLP traces/metrics/logs and forwards to the LGTM backend.
// =============================================================================

// ---------------------------------------------------------------------------
// OTLP Receiver — gRPC + HTTP
// All stacks push telemetry here via OTLP gRPC (port 4317) or OTLP HTTP (port
// 4318). Other stacks reference this service on the `pipeline` network as `otel`
// or `alloy`.
// ---------------------------------------------------------------------------
otelcol.receiver.otlp "default" {
    grpc {
        endpoint = "0.0.0.0:4317"
    }
    http {
        endpoint = "0.0.0.0:4318"
    }
}

// ---------------------------------------------------------------------------
// OTLP Exporter — Forward to LGTM
// Sends all received telemetry to the LGTM backend (grafana/otel-lgtm).
// The target endpoint is configurable via the ALLOY_OTLP_FORWARD_ENDPOINT env
// var, defaulting to http://lgtm:4318 (LGTM's OTLP HTTP endpoint on pipeline).
// ---------------------------------------------------------------------------
otelcol.exporter.otlp "lgtm" {
    client {
        endpoint = env("OTEL_EXPORTER_OTLP_ENDPOINT", "http://lgtm:4318")
        tls {
            insecure             = true
            insecure_skip_verify = true
        }
    }
}

// ---------------------------------------------------------------------------
// Pipeline — Connect receiver to exporter(s)
// Routes telemetry from the OTLP receiver to the LGTM exporter.
// ---------------------------------------------------------------------------
otelcol.pipeline "default" {
    receiver = otelcol.receiver.otlp.default
    exporter = otelcol.exporter.otlp.lgtm
}