logged the following github issue earlier but it was closed recommending me 
to start the discussion in the mailing list - 
https://github.com/prometheus/prometheus/issues/8152

On Thursday, November 5, 2020 at 9:48:08 PM UTC+5:30 Ponson T wrote:

> Hello Everyone, 
> Can anyone help me with this issue?
>
> *What did you do?*
>
>    1. Deployed Prometheus with default configuration
>    2. Deployed Node Exporter
>    3. Updated prometheus.yml configuration file and added node_exporter 
>    scrape job with 10s interval and set prometheus scrape job to 12s interval
>
>
> Open prometheus web console http://localhost:9090/graph and browse 
> metrics prometheus_target_interval_length_seconds
>
> *What did you expect to see?*
> It should have returned following time series
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="10s",job="node_exporter",quantile="0.01"}
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="10s",job="node_exporter",quantile="0.05"}
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="10s",job="node_exporter",quantile="0.5"}
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="10s",job="node_exporter",quantile="0.9"}
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="10s",job="node_exporter",quantile="0.99"}
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="12s",job="prometheus",quantile="0.01"}
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="12s",job="prometheus",quantile="0.05"}
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="12s",job="prometheus",quantile="0.5"}
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="12s",job="prometheus",quantile="0.9"}
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="12s",job="prometheus",quantile="0.99"}
>
> *What did you see instead? Under which circumstances?*
> It returns following time series. Every job label value is stamped as 
> prometheus.
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="10s",job="prometheus",quantile="0.01"}
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="10s",job="prometheus",quantile="0.05"}
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="10s",job="prometheus",quantile="0.5"}
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="10s",job="prometheus",quantile="0.9"}
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="10s",job="prometheus",quantile="0.99"}
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="12s",job="prometheus",quantile="0.01"}
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="12s",job="prometheus",quantile="0.05"}
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="12s",job="prometheus",quantile="0.5"}
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="12s",job="prometheus",quantile="0.9"}
>
> prometheus_target_interval_length_seconds{instance="localhost:9090",interval="12s",job="prometheus",quantile="0.99"}
> *System information: *
>
> Linux 5.4.0-52-generic x86_64
>
>
> *OS-Release:*
>
> cat /etc/os-release
> NAME="Ubuntu"
> VERSION="18.04.5 LTS (Bionic Beaver)"
> ID=ubuntu
> ID_LIKE=debian
> PRETTY_NAME="Ubuntu 18.04.5 LTS"
> VERSION_ID="18.04"
> HOME_URL="https://www.ubuntu.com/";
> SUPPORT_URL="https://help.ubuntu.com/";
> BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/";
> PRIVACY_POLICY_URL="
> https://www.ubuntu.com/legal/terms-and-policies/privacy-policy";
> VERSION_CODENAME=bionic
> UBUNTU_CODENAME=bionic
>
> *Prometheus version:*
>
> prometheus, version 2.22.0 (branch: HEAD, revision: 0a7fdd3 
> <https://github.com/prometheus/prometheus/commit/0a7fdd3b76960808c3a91d92267c3d815c1bc354>
> )
> build user: root@6321101b2c50
> build date: 20201015-12:29:59
> go version: go1.15.3
> platform: linux/amd64
>
> *Prometheus Configuration file:*
>
> # my global config
> global:
>   scrape_interval:     15s # Set the scrape interval to every 15 seconds. 
> Default is every 1 minute.
>   evaluation_interval: 15s # Evaluate rules every 15 seconds. The default 
> is every 1 minute.
>   # scrape_timeout is set to the global default (10s).
>
> # Alertmanager configuration
> alerting:
>   alertmanagers:
>   - static_configs:
>     - targets:
>       # - alertmanager:9093
>
> # Load rules once and periodically evaluate them according to the global 
> 'evaluation_interval'.
> rule_files:
>   # - "first_rules.yml"
>   # - "second_rules.yml"
>
> # A scrape configuration containing exactly one endpoint to scrape:
> # Here it's Prometheus itself.
> scrape_configs:
>   # The job name is added as a label `job=<job_name>` to any timeseries 
> scraped from this config.
>   - job_name: 'prometheus'
>     scrape_interval: 12s
>     # metrics_path defaults to '/metrics'
>     # scheme defaults to 'http'.
>
>     static_configs:
>     - targets: ['localhost:9090']
>
>   - job_name: 'node_exporter'
>     scrape_interval: 10s
>     static_configs:
>     - targets: ['localhost:9100', 'localhost:8081']
>       labels:
>         group: 'production'
>     - targets: ['localhost:8082']
>       labels:
>         group: 'canary'
>
>
>
>

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