Lab 9.1: Workaround Instrumentation Exercise in Python and Go

kino1994

For those of you who didn't get the 9.2 lab to work for me, I've found a workaround in Python:

1. Change to instrumentation code working branch:

git checkout instrumented

2. Check if python2 is installed with pip:

python2 --version

if python2 is no installed:

sudo apt-get install python2.7

if pip points to python3-pip and pip2.7 is no installed:

wget https://bootstrap.pypa.io/pip/2.7/get-pip.py
pip2.7 install prometheus-client

Or

pip install prometheus-client -> only if pip points to a python2 version

3. Then run the server:

python2 server.py

That worked for me

It would be nice if the examples were updated to python3...

kino1994

For go I've tried this with no luck.

go env -w GO111MODULE=off
go get -d
go run main.go

But found this error:

github.com/prometheus/common/expfmt
../../go/src/github.com/prometheus/common/expfmt/decode.go:89:38: cannot use v (variable of type *io_prometheus_client.MetricFamily) as protoreflect.ProtoMessage value in argument to pbutil.ReadDelimited: *io_prometheus_client.MetricFamily does not implement protoreflect.ProtoMessage (missing method ProtoReflect)
../../go/src/github.com/prometheus/common/expfmt/encode.go:120:40: cannot use v (variable of type *io_prometheus_client.MetricFamily) as protoreflect.ProtoMessage value in argument to pbutil.WriteDelimited: *io_prometheus_client.MetricFamily does not implement protoreflect.ProtoMessage (missing method ProtoReflect)

It would be fine if examples were updated and fixed...

mlaeufer

You can also run the python script with python3. But you have to change the imports to this:
from http.server import BaseHTTPRequestHandler
from http.server import HTTPServer
from socketserver import ThreadingMixIn