Tom-Goong commented on issue #7820: [FLINK-11742][Metrics]Push metrics to Pushgateway without "instance" URL: https://github.com/apache/flink/pull/7820#issuecomment-468116677 @zentol I am sorry for the reckless submission of PR. As a newcomer, I am still not familiar with the norms of the community and will be more in line with the norms in the future. I will close this PR and JIRA later. By the way, I will talk about the some information I found. https://github.com/prometheus/pushgateway#about-the-job-and-instance-labels > The Prometheus server will attach a job label and an instance label to each scraped metric. The value of the job label comes from the scrape configuration. When you configure the Pushgateway as a scrape target for your Prometheus server, you will probably pick a job name like pushgateway. The value of the instance label is automatically set to the host and port of the target scraped. Hence, all the metrics scraped from the Pushgateway will have the host and port of the Pushgateway as the instance label and a job label like pushgateway. The conflict with the job and instance labels you might have attached to the metrics pushed to the Pushgateway is solved by renaming those labels to exported_job and exported_instance. > However, this behavior is usually undesired when scraping a Pushgateway. Generally, you would like to retain the job and instance labels of the metrics pushed to the Pushgateway. That's why you have set honor_labels: true in the scrape config for the Pushgateway. It enables the desired behavior. See the documentation for details. > This leaves us with the case where the metrics pushed to the Pushgateway do not feature an instance label. This case is quite common as the pushed metrics are often on a service level and therefore not related to a particular instance. Even with honor_labels: true, the Prometheus server will attach an instance label if no instance label has been set in the first place. **Therefore, if a metric is pushed to the Pushgateway without an instance label (and without instance label in the grouping key, see below), the Pushgateway will export it with an emtpy instance label ({instance=""}), which is equivalent to having no instance label at all but prevents the server from attaching one.**
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