chore: Capture Nginx and Gunicorn logs in stdout

[microamp]

Fixes #432 and #433

I can see both Nginx and Gunicorn logs when I run kubectl logs -f locally now.

127.0.0.1 - - [23/Apr/2024:04:23:57 +0100] "GET /healthz HTTP/1.0" 200 2 "-" "kube-probe/1.28" "10.244.0.1"
127.0.0.1 - - [23/Apr/2024:04:23:57 +0100] "GET /healthz HTTP/1.0" 200 2 "-" "kube-probe/1.28" "10.244.0.1"
10.244.0.1 - - [23/Apr/2024:03:23:57 +0000] "GET /healthz HTTP/1.1" 200 2 "-" "kube-probe/1.28"
10.244.0.1 - - [23/Apr/2024:03:23:57 +0000] "GET /healthz HTTP/1.1" 200 2 "-" "kube-probe/1.28"
127.0.0.1 - - [23/Apr/2024:04:24:06 +0100] "GET / HTTP/1.0" 200 30624 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:124.0) Gecko/20100101 Firefox/124.0" "127.0.0.1"
127.0.0.1 - - [23/Apr/2024:03:24:06 +0000] "GET / HTTP/1.1" 200 5552 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:124.0) Gecko/20100101 Firefox/124.0"
127.0.0.1 - - [23/Apr/2024:03:24:06 +0000] "GET /static/dist/main.9949552e4686.css HTTP/1.1" 200 324461 "http://localhost:8080/" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:124.0) Gecko/20100101 Firefox/124.0"
127.0.0.1 - - [23/Apr/2024:03:24:06 +0000] "GET /static/img/youtube-icon.c20ebf0e90c8.svg HTTP/1.1" 200 930 "http://localhost:8080/" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:124.0) Gecko/20100101 Firefox/124.0"

However, I'm not sure about the second commit. Configuring the Grafana agent to read from a file path may be cleaner (e.g. /var/log/nginx/access.log). To be discussed further.

Update: Fixing #433 in the same PR now.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.80%. Comparing base (9a3f9f6) to head (3a0acad).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #434   +/-   ##
=======================================
  Coverage   82.80%   82.80%           
=======================================
  Files         126      126           
  Lines        2611     2611           
=======================================
  Hits         2162     2162           
  Misses        449      449           

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[NGPixel]

Output should be in json format for easier tagging

[microamp]

Output should be in json format for easier tagging

Currently as a separate ticket here, #433, but happy to combine them

[microamp]

Application logs are now in JSON format. e.g.

{"remote_host": "127.0.0.1", "remote_logname": "-", "remote_user": "-", "timestamp": "[24/Apr/2024:10:04:55 +0100]", "request": "GET /announcements/ HTTP/1.0", "status_code": "200", "response_size": "37152", "referrer": "http://localhost:8080/announcements/reappointment-of-eliot-lear-as-independent-submission-editor/", "user_agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36", "x_forwarded_for": "127.0.0.1"}

Pretty-printed:

{
  "remote_host": "127.0.0.1",
  "remote_logname": "-",
  "remote_user": "-",
  "timestamp": "[24/Apr/2024:10:04:55 +0100]",
  "request": "GET /announcements/ HTTP/1.0",
  "status_code": "200",
  "response_size": "37152",
  "referrer": "http://localhost:8080/announcements/reappointment-of-eliot-lear-as-independent-submission-editor/",
  "user_agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36",
  "x_forwarded_for": "127.0.0.1"
}

[microamp]

"%({X-Forwarded-For}i)s"

is now all lowercase, i.e.

"%({x-forwarded-for}i)s"

as per the official documentation

Use lowercase for header and environment variable names, and put {...}x names inside %(...)s. For example:

%({x-forwarded-for}i)s

https://docs.gunicorn.org/en/stable/settings.html#access-log-format

[microamp]

@NGPixel Mind having another look when you can please?