// ============================================================================
// Grafana Alloy 配置文件 - 用于监控 agent_runner 进程
// ============================================================================
// 此配置文件实现：
// 1. 自动发现 agent_runner 及其子进程
// 2. 使用 eBPF 进行 CPU 性能剖析
// 3. 将性能数据发送到 Pyroscope Server
// ============================================================================

// ============================================================================
// 进程发现 - 发现所有运行中的进程
// ============================================================================
discovery.process "all" {
}

// ============================================================================
// 进程过滤 - 只保留 agent_runner 相关进程
// ============================================================================
discovery.relabel "agent_runner_filter" {
    targets = discovery.process.all.targets

    // 规则 1: 保留 agent_runner 主进程及其所有子进程
    // 匹配条件：进程名是 agent_runner 或者父进程 PID 是 1
    rule {
        source_labels = ["__meta_process_exe", "__meta_process_ppid"]
        regex   = ".*/agent_runner|;1"
        action  = "keep"
    }

    // 规则 2: 添加进程 PID 标签
    rule {
        source_labels = ["__meta_process_pid"]
        target_label  = "process_pid"
    }

    // 规则 3: 添加进程名称标签
    rule {
        source_labels = ["__meta_process_comm"]
        target_label  = "process_name"
    }

    // 规则 4: 添加完整执行路径标签
    rule {
        source_labels = ["__meta_process_exe"]
        target_label  = "process_exe"
    }

    // 规则 5: 添加父进程 PID 标签
    rule {
        source_labels = ["__meta_process_ppid"]
        target_label  = "parent_pid"
    }

    // 规则 6: 添加命令行参数标签
    rule {
        source_labels = ["__meta_process_cmdline"]
        target_label  = "process_cmdline"
    }

    // 规则 7: 添加环境标签
    rule {
        target_label = "env"
        replacement  = "dev"
    }

    // 规则 8: 添加容器 ID 标签（从环境变量动态组合）
    rule {
        target_label = "container_id"
        replacement  = "agent-${env:USER_ID}"
    }

    // 规则 9: 添加应用名称标签
    rule {
        target_label = "job"
        replacement  = "agent_runner"
    }

    // 规则 10: 添加实例标签（从环境变量动态组合）
    rule {
        target_label = "instance"
        replacement  = "agent-${env:USER_ID}"
    }

    // 添加集群标签
    rule {
        target_label = "cluster"
        replacement  = "rcoder"
    }

    // 添加数据中心标签
    rule {
        target_label = "datacenter"
        replacement  = "local"
    }
}

// ============================================================================
// 写入 Pyroscope Server
// ============================================================================
pyroscope.write "remote" {
    endpoint {
        url = "http://pyroscope:4040"
    }

    external_labels = {
        "env"        = "dev",
        "datacenter" = "local",
        "cluster"    = "rcoder",
    }
}

// ============================================================================
// eBPF 性能分析组件
// ============================================================================
pyroscope.ebpf "agent_runner" {
    forward_to = [pyroscope.write.remote.receiver]

    targets = discovery.relabel.agent_runner_filter.output

    sample_rate = 97
    collect_interval = "15s"

    collect_user_profile   = true
    collect_kernel_profile = false

    python_enabled = true
}

// ============================================================================
// Prometheus Remote Write
// ============================================================================
prometheus.remote_write "metrics" {
    endpoint {
        url = "http://prometheus:9090/api/v1/write"
    }

    external_labels = {
        "env"        = "dev",
        "datacenter" = "local",
        "cluster"    = "rcoder",
    }
}