[prometheus-users] Why does the federate endpoint return all metrics as untyped?

[心若寒江雪]

prometheus federate api

# TYPE hermes_req_proc_time untyped
hermes_req_proc_time{statsdtype="timers",gs_app="someapp",job="aggregator_10s",instance="
172.24.0.7:9080",gs_dc="us-east-1",gs_svcuser="svcuser2",gs_statistics="lower",gs_service="hermes",gs_hostname="someapp-01",gs_env="dev",gs_instanceid="8ef31bcd",id="prom-1"}
 
156 1473292292860
# TYPE netdev untyped
netdev{dev="eth0",gs_svcuser="svcuser2",gs_env="dev",gs_instanceid="aabd3924",type="byteout",instance="container-metrics:9092",gs_dc="us-east-1",job="promclient_triton_5s",id="prom-1"}
 
2.198199005e+09 1473292299525
# TYPE hermes_req_proc_time untyped
hermes_req_proc_time{gs_dc="us-east-1",job="aggregator_10s",gs_statistics="sum",gs_service="hermes",gs_instanceid="8ef31bcd",gs_svcuser="svcuser2",statsdtype="timers",gs_env="dev",instance="
172.24.0.7:9080",gs_app="someapp",gs_hostname="someapp-01",id="prom-1"} 
6778 1473292292860


How does upper Prometheus in the Prometheus federated cluster know what 
kind of Metrics they are getting from the federate interface of lower 
Prometheus?

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[prometheus-users] Why does the federate endpoint return all metrics as untyped?

[心若寒江雪]

curl http://127.0.0.1:9090/federate?match[]={job!=""}
output:
# TYPE scrape_duration_seconds untyped 
scrape_duration_seconds{instance="172.31.24.196:18080",job="rs"} 
0.000687693 1671095235507 # TYPE scrape_samples_post_metric_relabeling 
untyped 
scrape_samples_post_metric_relabeling{instance="172.31.24.196:18080",job="rs"} 
0 1671095235507 # TYPE scrape_samples_scraped untyped 
scrape_samples_scraped{instance="172.31.24.196:18080",job="rs"} 0 
1671095235507 # TYPE scrape_series_added untyped 
scrape_series_added{instance="172.31.24.196:18080",job="rs"} 0 
1671095235507 # TYPE up untyped up{instance="172.31.24.196:18080",job="rs"} 
0 1671095235507

How does upper Prometheus in the Prometheus federated cluster know what 
kind of Metrics they are getting from the federate interface of lower 
Prometheus?



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