Stopping Alloy in a docker compose project only shuts down after receiving the SIGKILL signal

[vpmedia]

What's wrong?

If I try to stop my docker compose project's containers (docker compose down), Alloy only shuts down after receiving SIGKILL.
I would expect that it would shut down gracefully receiving SIGTERM signal.
https://docs.docker.com/compose/support-and-feedback/faq/#why-do-my-services-take-10-seconds-to-recreate-or-stop

✔ Container dev-alloy-1 Removed 10.1s

Steps to reproduce

Try to shutdown a docker compose project including Alloy.
For the full list of services being used see the log file below.

System information

MacOS 15 and Ubuntu Linux

Software version

grafana/alloy:v1.4.3

Configuration

livedebugging {
    enabled = true
}

logging {
    level  = "info"
    format = "json"
}

discovery.docker "flog_scrape" {
    host             = "unix:///var/run/docker.sock"
    refresh_interval = "10s"
}

discovery.relabel "flog_scrape" {
    targets = []

    rule {
        source_labels = ["__meta_docker_container_name"]
        regex         = "/(.*)"
        target_label  = "container"
    }

    rule {
        source_labels = ["__meta_docker_container_log_stream"]
        target_label  = "logstream"
    }

    rule {
        source_labels = ["__meta_docker_container_label_logging_jobname"]
        target_label  = "job"
    }

    rule {
        source_labels = ["__meta_docker_container_label_com_docker_compose_service"]
        target_label  = "service_name"
    }
}

loki.source.docker "flog_scrape" {
    host             = "unix:///var/run/docker.sock"
    targets          = discovery.docker.flog_scrape.targets
    forward_to       = [loki.write.default.receiver]
    relabel_rules    = discovery.relabel.flog_scrape.rules
    refresh_interval = "10s"
}

loki.write "default" {
    endpoint {
        url = "http://loki:3100/loki/api/v1/push"
    }
    external_labels = {
        deployment_environment = env("ALLOY_LOKI_LABEL_DEPLOYMENT_ENVIRONMENT"),
        host_name = env("ALLOY_LOKI_LABEL_HOST_NAME"),
    }
}

otelcol.receiver.otlp "default" {
    grpc {
        endpoint = "0.0.0.0:4317"
    }

    http {
        endpoint = "0.0.0.0:4318"
        cors {
            allowed_origins = [
                "http://127.0.0.1",
            ]
        }
    }

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

otelcol.processor.batch "default" {
    output {
        metrics = [otelcol.exporter.prometheus.default.input]
        logs    = [otelcol.exporter.loki.default.input]
        traces  = [otelcol.exporter.otlp.default.input]
    }
}

otelcol.exporter.debug "default" {}

otelcol.exporter.otlp "default" {
    client {
        endpoint = "tempo:4317"

        tls {
            insecure = true
            insecure_skip_verify = true
        }
    }
}

otelcol.exporter.prometheus "default" {
        forward_to = [prometheus.remote_write.default.receiver]
    }

prometheus.remote_write "default" {
    endpoint {
        url = "http://prometheus:9090/api/v1/write"
        send_native_histograms = false
    }
}

otelcol.exporter.loki "default" {
    forward_to = [loki.write.default.receiver]
}

Logs

✔ Container dev-prometheus_mysql_exporter-1 Removed 0.3s
✔ Container dev-prometheus_redis_exporter-1 Removed 0.2s
✔ Container dev-prometheus_alertmanager-1 Removed 0.2s
✔ Container dev-grafana-1 Removed 0.3s
✔ Container dev-alloy-1 Removed 10.1s <- exited after default 10s shutdown timeout
✔ Container dev-prometheus_node_exporter-1 Removed 0.4s
✔ Container dev-prometheus_blackbox_exporter-1 Removed 0.2s
✔ Container dev-redis-1 Removed 0.2s
✔ Container dev-mysql-1 Removed 1.0s
✔ Container dev-prometheus-1 Removed 0.1s
✔ Container dev-loki-1 Removed 2.0s
✔ Container dev-tempo-1 Removed 1.9s
✔ Network dev_default Removed 0.1s

...

tempo-1 exited with code 0
loki-1 exited with code 0
alloy-1 exited with code 137 <- received SIGKILL