Application Observability export with Grafana Agent

otelcol.receiver.otlp "default" {
	// https://grafana.com/docs/agent/latest/static/flow/reference/components/otelcol.receiver.otlp/

	// configures the default grpc endpoint "0.0.0.0:4317"
	grpc { }
	// configures the default http/protobuf endpoint "0.0.0.0:4318"
	http { }

	output {
		metrics = [otelcol.processor.transform.add_resource_attributes_as_metric_attributes.input]
		logs    = [otelcol.processor.batch.default.input]
		traces  = [otelcol.processor.batch.default.input]
	}
}

otelcol.processor.transform "add_resource_attributes_as_metric_attributes" {
	// https://grafana.com/docs/agent/latest/flow/reference/components/otelcol.processor.transform/
	error_mode = "ignore"
	metric_statements {
		context = "datapoint"
		statements = [
			"set(attributes[\"deployment.environment\"], resource.attributes[\"deployment.environment\"])",
			"set(attributes[\"service.version\"], resource.attributes[\"service.version\"])",
		]
	}
	output {
		metrics = [otelcol.processor.batch.default.input]
	}
}

otelcol.processor.batch "default" {
	// https://grafana.com/docs/agent/latest/flow/reference/components/otelcol.processor.batch/
	output {
		metrics = [otelcol.exporter.prometheus.grafana_cloud_prometheus.input]
		logs    = [otelcol.exporter.loki.grafana_cloud_loki.input]
		traces  = [otelcol.exporter.otlp.grafana_cloud_tempo.input]
	}
}

otelcol.exporter.loki "grafana_cloud_loki" {
	// https://grafana.com/docs/agent/latest/flow/reference/components/otelcol.exporter.loki/
	forward_to = [loki.write.grafana_cloud_loki.receiver]
}

otelcol.exporter.prometheus "grafana_cloud_prometheus" {
	// https://grafana.com/docs/agent/latest/flow/reference/components/otelcol.exporter.prometheus/
	add_metric_suffixes = false
	forward_to = [prometheus.remote_write.grafana_cloud_prometheus.receiver]
}

prometheus.remote_write "grafana_cloud_prometheus" {
	// https://grafana.com/docs/agent/latest/flow/reference/components/prometheus.remote_write/
	endpoint {
		url = env("GRAFANA_CLOUD_PROMETHEUS_URL")

		basic_auth {
			username = env("GRAFANA_CLOUD_PROMETHEUS_USERNAME")
			password = env("GRAFANA_CLOUD_API_KEY")
		}
	}
}

loki.write "grafana_cloud_loki" {
	// https://grafana.com/docs/agent/latest/flow/reference/components/loki.write/
	endpoint {
		url = env("GRAFANA_CLOUD_LOKI_URL")

		basic_auth {
			username = env("GRAFANA_CLOUD_LOKI_USERNAME")
			password = env("GRAFANA_CLOUD_API_KEY")
		}
	}
}

otelcol.exporter.otlp "grafana_cloud_tempo" {
	// https://grafana.com/docs/agent/latest/flow/reference/components/otelcol.exporter.otlp/
	client {
		endpoint = env("GRAFANA_CLOUD_TEMPO_ENDPOINT")
		auth     = otelcol.auth.basic.grafana_cloud_tempo.handler
	}
}

otelcol.auth.basic "grafana_cloud_tempo" {
	// https://grafana.com/docs/agent/latest/flow/reference/components/otelcol.auth.basic/
	username = env("GRAFANA_CLOUD_TEMPO_USERNAME")
    password = env("GRAFANA_CLOUD_API_KEY")
}