Promtail 多行不合并堆栈跟踪

Question

Promtail、Grafana、Loki 版本为 2.4.1。运行是 Kubernetes。

日志中的异常与正则表达式匹配。（ZeroWidthSpace 在日志行的开头）
多线阶段设置见附件配置(promtail.yaml)

我原以为错误堆栈跟踪会出现在 grafana/loki 中的单个条目中，但每一行都是一个单独的条目。我是否缺少一些配置？

# cat /etc/promtail/promtail.yaml 
server:
  log_level: info
  http_listen_port: 3101

client:
  url: http://***-loki:3100/loki/api/v1/push
  

positions:
  filename: /run/promtail/positions.yaml

scrape_configs:
  # See also https://github.com/grafana/loki/blob/master/production/ksonnet/promtail/scrape_config.libsonnet for reference
  - job_name: kubernetes-pods
    pipeline_stages:
      - multiline:
          firstline: ^\x{200B}\[
          max_lines: 128
          max_wait_time: 3s
    kubernetes_sd_configs:
      - role: pod
    relabel_configs:
      - source_labels:
          - __meta_kubernetes_pod_controller_name
        regex: ([0-9a-z-.]+?)(-[0-9a-f]{8,10})?
        action: replace
        target_label: __tmp_controller_name
      - source_labels:
          - __meta_kubernetes_pod_label_app_kubernetes_io_name
          - __meta_kubernetes_pod_label_app
          - __tmp_controller_name
          - __meta_kubernetes_pod_name
        regex: ^;*([^;]+)(;.*)?$
        action: replace
        target_label: app
      - source_labels:
          - __meta_kubernetes_pod_label_app_kubernetes_io_component
          - __meta_kubernetes_pod_label_component
        regex: ^;*([^;]+)(;.*)?$
        action: replace
        target_label: component
      - action: replace
        source_labels:
        - __meta_kubernetes_pod_node_name
        target_label: node_name
      - action: replace
        source_labels:
        - __meta_kubernetes_namespace
        target_label: namespace
      - action: replace
        replacement: 
        separator: /
        source_labels:
        - namespace
        - app
        target_label: job
      - action: replace
        source_labels:
        - __meta_kubernetes_pod_name
        target_label: pod
      - action: replace
        source_labels:
        - __meta_kubernetes_pod_container_name
        target_label: container
      - action: replace
        replacement: /var/log/pods/*/*.log
        separator: /
        source_labels:
        - __meta_kubernetes_pod_uid
        - __meta_kubernetes_pod_container_name
        target_label: __path__
      - action: replace
        regex: true/(.*)
        replacement: /var/log/pods/*/*.log
        separator: /
        source_labels:
        - __meta_kubernetes_pod_annotationpresent_kubernetes_io_config_hash
        - __meta_kubernetes_pod_annotation_kubernetes_io_config_hash
        - __meta_kubernetes_pod_container_name
        target_label: __path__

Answer 1

事实证明，日志看起来与我们在镜头荚日志或 kubectl logs {pod} 中看到的不同。

promtail消费的原始日志可以在主机上找到：

minikube ssh
cat /var/log/pods/{namespace}_{pod}/{container}/0.log

它们看起来像这样：

{"log":"[default-nioEventLoopGroup-1-1] INFO  HTTP_ACCESS_LOGGER - \"GET /health/readiness HTTP/1.1\" 200 523\n","stream":"stdout","time":"2021-12-17T12:26:29.702621198Z"}

因此，第一行正则表达式不匹配任何日志行。不幸的是，promtail 日志中没有关于此的错误。

这是 docker 日志格式，有一个管道阶段可以解析它：

- docker: {}

此外，日志中还有一个问题。多行堆栈跟踪中有额外的换行符，所以这个额外的管道阶段过滤它们：

- replace:
   expression: '(\n)'
   replace: ''

所以我的工作配置如下所示：

server:
  log_level: info
  http_listen_port: 3101

client:
  url: http://***-loki:3100/loki/api/v1/push
  

positions:
  filename: /run/promtail/positions.yaml

scrape_configs:
  # See also https://github.com/grafana/loki/blob/master/production/ksonnet/promtail/scrape_config.libsonnet for reference
  - job_name: kubernetes-pods
    pipeline_stages:
      - docker: {}
      - multiline:
          firstline: ^\x{200B}\[
          max_lines: 128
          max_wait_time: 3s
      - replace:
          expression: (\n)
          replace: ""

#config continues below (not copied)

Promtail 多行不合并堆栈跟踪

Promtail multiline does not merge stacktrace

logging

grafana

kubernetes

grafana-loki

promtail