Checking target on promtool returns "error while linting: text format parsing error in line 1: invalid metric name"?

Question

Monitoring

Hello.
Wrote a python application that, by API request
http://server01:8001/metrics
, returns both in
print(stdout)
and in

def do_GET(s):
s.wfile.write(output.encode())

# Found hosts: 2
some_metrics{hostname="sever01", key_="system.cpu.util.usage"} 4
some_metrics{hostname="server01", key_="vfs.fs.size[/data,free]"} 180073318400
some_metrics{hostname="server02", key_="system.cpu.util.usage"} 0
some_metrics{hostname="server02", key_="vfs.fs.size[/data,free]"} 597773049856

in prometheus I
registered a new target like this,

- job_name: some_metrics
    metrics_path: /metrics
    static_configs:
      - targets: ['server01:8001']

It was not possible to find data in promtheus.
Checked with promtool

curl -s http://server01:8001/metrics | /data/prometheus/promtool check metrics

it returned an error

error while linting: text format parsing error in line 1: invalid metric

How to solve this problem?

Answer 1

Try going to the Status -> Targets section in the prometheus web interface . And there may be an additional error for your endpoint.
In my case, it was that it was not authorized (server returned HTTP status 401 Unauthorized)