Prometheus：根据标签值进行条件并添加其他结果作为信息

发布于 2025-01-16 07:03:24 字数 599 浏览 2 评论 0原文

我有一个查询来执行

sum by(proxy, code) (rate(haproxy_server_http_responses_total{code=~"5xx|2xx",proxy="api_backend"}[10m]))

此查询的结果，

{code="2xx", proxy="api_backend"} value1
{code="5xx", proxy="api_backend"} value2

我想仅在 value2 > 时触发警报x 并添加有关 value2 的额外信息。（让 value2 因为它是无条件的）

我已尝试此代码，但它不起作用

sum by(proxy, code) (rate(haproxy_server_http_responses_total{code="5xx",proxy="api_backend"}[10m])) > x or sum by(proxy, code) (rate(haproxy_server_http_responses_total{code="2xx",proxy="api_backend"}[10m]))

原文

i have a query to perform

sum by(proxy, code) (rate(haproxy_server_http_responses_total{code=~"5xx|2xx",proxy="api_backend"}[10m]))

the result of this query

{code="2xx", proxy="api_backend"} value1
{code="5xx", proxy="api_backend"} value2

i want to trigger the alert only when value2 > x and add extra information about value2.(let value2 as it is without condition)

I have trying this code but it is not working

sum by(proxy, code) (rate(haproxy_server_http_responses_total{code="5xx",proxy="api_backend"}[10m])) > x or sum by(proxy, code) (rate(haproxy_server_http_responses_total{code="2xx",proxy="api_backend"}[10m]))

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路还长，别太狂 2025-01-23 07:03:24

尝试以下 PromQL 查询：

(
  sum by(proxy)
  (rate(haproxy_server_http_responses_total{code="2xx",proxy="api_backend"}[10m]))
)
and
(
  sum by(proxy)
  (rate(haproxy_server_http_responses_total{code="5xx",proxy="api_backend"}[10m])) > x
)

对于 5xx 响应率高于 x 的代理，它应该返回 2xx 响应率。

它是如何运作的？

上面查询中的 by(proxy, code) 被替换为 by(proxy)。这是因为 Prometheus 在 a 和 b 端使用相同的标签集对时间序列执行 a op b 查询。在原始查询中，标签集并不相同，因为它们的 code 标签值不同。请参阅Prometheus 中二元运算符的匹配规则。
or 运算符替换为 and 运算符，并且 rate(...{code="2xx"} 放入查询的前面，因为当 b 处存在具有相同标签集的匹配时间序列时，a 和 b 返回 a。一个href="https://prometheus.io/docs/prometheus/latest/querying/operators/#ological-set-binary-operators" rel="nofollow noreferrer">这些文档了解有关 或 和 and 运算符。

Try the following PromQL query:

(
  sum by(proxy)
  (rate(haproxy_server_http_responses_total{code="2xx",proxy="api_backend"}[10m]))
)
and
(
  sum by(proxy)
  (rate(haproxy_server_http_responses_total{code="5xx",proxy="api_backend"}[10m])) > x
)

It should return 2xx response rates for proxies with 5xx response rates higher than x.

How does it work?

The by(proxy, code) is substituted with by(proxy) in the query above. This is because Prometheus performs a op b query over time series with identical sets of labels at a and b sides. In the original query the set of labels weren't identical, because they differ by code label value. See matching rules for binary operators in Prometheus.
The or operator is substituted with and operator and the rate(...{code="2xx"} is put in the front of the query, since a and b returns a when there is a matching time series with the same set of labels at b. See these docs for details about or and and operators.