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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