How to install and configure Nginx reverse proxy for an Instana Agent on a Ubuntu server to work with OpenTelemetry

sudo apt-get update -y
sudo apt-get install nginx
# if firewall enabled on the server --- otherwise to be ignored
sudo ufw allow ssh
sudo ufw allow 'Nginx Full'
sudo ufw enable

sudo systemctl status nginx
# if not running, make it run and enable it as a service on the server start
sudo systemctl start nginx
sudo systemctl enable nginx

cd /etc/nginx/sites-enabled

cat <<'ENDOFFILE' >default
##
# You should look at the following URL's in order to grasp a solid understanding
# of Nginx configuration files in order to fully unleash the power of Nginx.
# https://www.nginx.com/resources/wiki/start/
# https://www.nginx.com/resources/wiki/start/topics/tutorials/config_pitfalls/
# https://wiki.debian.org/Nginx/DirectoryStructure
#
# In most cases, administrators will remove this file from sites-enabled/ and
# leave it as reference inside of sites-available where it will continue to be
# updated by the nginx packaging team.
#
# This file will automatically load configuration files provided by oth
# applications, such as Drupal or Wordpress. These applications will be made
# available underneath a path with that package name, such as /drupal8.
#
# Please see /usr/share/doc/nginx-doc/examples/ for more detailed examples.
##

# Default server configuration
#
server {
 listen 80 default_server;
 listen [::]:80 default_server;


 # SSL configuration
 #
 # listen 443 ssl default_server;
 # listen [::]:443 ssl default_server;
 #
 # Note: You should disable gzip for SSL traffic.
 # See: https://bugs.debian.org/773332
 #
 # Read up on ssl_ciphers to ensure a secure configuration.
 # See: https://bugs.debian.org/765782
 #
 # Self signed certs generated by the ssl-cert package
 # Don't use them in a production server!
 #
 # include snippets/snakeoil.conf;

 root /var/www/html;

 # Add index.php to the list if you are using PHP
 index index.html index.htm index.nginx-debian.html;

 server_name _;

 location / {
  # First attempt to serve request as file, then
  # as directory, then fall back to displaying a 404.
  try_files $uri $uri/ =404;
 }

 # pass PHP scripts to FastCGI server
 #
 #location ~ \.php$ {
 # include snippets/fastcgi-php.conf;
 #
 # # With php-fpm (or other unix sockets):
 # fastcgi_pass unix:/run/php/php7.4-fpm.sock;
 # # With php-cgi (or other tcp sockets):
 # fastcgi_pass 127.0.0.1:9000;
 #}

 # deny access to .htaccess files, if Apache's document root
 # concurs with nginx's one
 #
 #location ~ /\.ht {
 # deny all;
 #}
}

server {
        access_log /var/log/nginx/access_42700.log;
        error_log /var/log/nginx/error.log error;
        listen 42700;
        listen [::]:42700;
        location / {
                proxy_pass http://localhost:42699;
        }
}        
server {
        access_log /var/log/nginx/access_42717.log;
        error_log /var/log/nginx/error.log error;
        listen 42717 http2 ;
        location / {
                grpc_pass 127.0.0.1:4317;
        }
}
server {
        access_log /var/log/nginx/access_42718.log;
        error_log /var/log/nginx/error.log error;
        listen 42718;
        listen [::]:42718;
        location / {
                proxy_pass http://localhost:4318;
        }
}

# Virtual Host configuration for example.com
#
# You can move that to a different file under sites-available/ and symlink that
# to sites-enabled/ to enable it.
#
#server {
# listen 80;
# listen [::]:80;
#
# server_name example.com;
#
# root /var/www/example.com;
# index index.html;
#
# location / {
#  try_files $uri $uri/ =404;
# }
#}
ENDOFFILE  

sudo service nginx restart