警报策略“在匹配的资源上满足所有条件”与过滤器或groupByFields不匹配

Question

由于GCP Stackdriver为发布/订阅创建了警报，因此我愿意创建一个警报，例如“如果订阅中有XXX个以上的主题在等待消息（未确认）以及该消费者在该消息上的消费率，主题接近0，然后触发警报”。

我已经习惯了Prometheus，在这里我可以简单地依靠标签来加入时间序列，但是我想知道如何使用Stackdriver。

起初，我考虑使用2个条件，即“在匹配资源上满足所有条件时违反策略”，但是我想知道“匹配资源”是否与普罗米修斯的行为相同。

这是我考虑过的警报，但是即使未完全满足这两个条件，它似乎也会触发：

{
  "combiner": "AND_WITH_MATCHING_RESOURCE",
  "conditions": [
    {
      "conditionThreshold": {
        "aggregations": [
          {
            "alignmentPeriod": "60s",
            "crossSeriesReducer": "REDUCE_SUM",
            "groupByFields": [
              "metadata.system_labels.topic_id",
              "resource.label.subscription_id"
            ],
            "perSeriesAligner": "ALIGN_RATE"
          }
        ],
        "comparison": "COMPARISON_LT",
        "duration": "300s",
        "filter": "metric.type=\"pubsub.googleapis.com/subscription/ack_message_count\" resource.type=\"pubsub_subscription\" resource.label.\"project_id\"=\"pl-service-prod-lm-fr\"",
        "thresholdValue": 1,
        "trigger": {
          "count": 1
        }
      },
      "displayName": "Ack message count"
    },
    {
      "conditionThreshold": {
        "aggregations": [
          {
            "alignmentPeriod": "60s",
            "crossSeriesReducer": "REDUCE_SUM",
            "groupByFields": [
              "metadata.system_labels.topic_id",
              "resource.label.subscription_id"
            ],
            "perSeriesAligner": "ALIGN_MEAN"
          }
        ],
        "comparison": "COMPARISON_GT",
        "duration": "300s",
        "filter": "metric.type=\"pubsub.googleapis.com/subscription/num_undelivered_messages\" resource.type=\"pubsub_subscription\" resource.label.\"project_id\"=\"pl-service-prod-lm-fr\"",
        "trigger": {
          "count": 1
        }
      },
      "displayName": "Unacked messages"
    }
  ],
  "displayName": "Pub/Sub is not consumed",
  "enabled": true,
  "incidentStrategy": {}
}