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Bug#1010054: prometheus-blackbox-exporter: ignores --log.level= commandline flag

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  Bug#1010054: prometheus-blackbox-exporter: ignores --log.level= commandline flag Tobias Klausmann <klausman@schwarzvogel.de> - 2022-04-23 13:30 +0200
    Bug#1010054:  Daniel Swarbrick <daniel.swarbrick@ionos.com> - 2022-05-10 21:00 +0200
    Bug#1010054:  Daniel Swarbrick <daniel.swarbrick@ionos.com> - 2022-05-10 21:00 +0200

#1101073 — Bug#1010054: prometheus-blackbox-exporter: ignores --log.level= commandline flag

Package: prometheus-blackbox-exporter
Version: 0.19.0-2
Severity: normal

Dear Maintainer,

This is essentially the same bug as #1002729, and likely caused by
broken vendoring.

-- System Information:
Debian Release: bookworm/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 5.16.0-6-amd64 (SMP w/12 CPU threads; PREEMPT)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages prometheus-blackbox-exporter depends on:
ii  adduser                3.121
ii  debconf [debconf-2.0]  1.5.79
ii  init-system-helpers    1.62
ii  libc6                  2.33-7
ii  libcap2-bin            1:2.44-1

prometheus-blackbox-exporter recommends no packages.

prometheus-blackbox-exporter suggests no packages.

-- Configuration Files:
/etc/prometheus/blackbox.yml changed:
modules:
  http_2xx:
    prober: http
    http:
  http_post_2xx:
    prober: http
    http:
      method: POST
  tcp_connect:
    prober: tcp
  pop3s_banner:
    prober: tcp
    tcp:
      query_response:
      - expect: "^+OK"
      tls: true
      tls_config:
        insecure_skip_verify: false
  ssh_banner:
    prober: tcp
    tcp:
      query_response:
      - expect: "^SSH-2.0-"
  irc_banner:
    prober: tcp
    tcp:
      query_response:
      - send: "NICK prober"
      - send: "USER prober prober prober :prober"
      - expect: "PING :([^ ]+)"
        send: "PONG ${1}"
      - expect: "^:[^ ]+ 001"
  icmp:
    prober: icmp


-- debconf information:
  prometheus-blackbox-exporter/want_cap_net_raw: false

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#1102730 — Bug#1010054:

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Looking at the changes for prometheus/common v0.26.0, I see:

- Replace go-kit/kit/log with go-kit/log

This just jogged my memory as to what the issue is. For whatever reason,
the log level is not set correctly if the exporter still uses
go-kit/kit/log (instead of the newer go-kit/log) and is built with
prometheus/common v0.26.0 or later.

blackbox_exporter v0.19.0 still uses go-kit/kit/log, so the options are
either to patch that in Debian to use go-kit/log, or update to
blackbox_exporter v0.20.0, which uses the latter.

On Tue, May 10, 2022 at 8:08 PM Daniel Swarbrick <daniel.swarbrick@ionos.com>
wrote:

> Several months ago I encountered the same bug with
> prometheus-smokeping-prober, and fixed it, but my brain is a bit foggy
> right now as to what the root cause was.
>
> However, for prometheus-blackbox-exporter at least, the --log.level flag
> is respected so long as you build / run it with the dependency versions
> specified by go.mod - up until using prometheus/common v0.26.0 or later -
> at which point the --log.level flag is no longer honoured. This version
> number sticks in my mind from the smokeping_prober bug too.
>
> I will follow up with more information shortly.
>

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#1102737 — Bug#1010054:

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Several months ago I encountered the same bug with
prometheus-smokeping-prober, and fixed it, but my brain is a bit foggy
right now as to what the root cause was.

However, for prometheus-blackbox-exporter at least, the --log.level flag is
respected so long as you build / run it with the dependency versions
specified by go.mod - up until using prometheus/common v0.26.0 or later -
at which point the --log.level flag is no longer honoured. This version
number sticks in my mind from the smokeping_prober bug too.

I will follow up with more information shortly.

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