Remove /metrics from the website

Similar data is already generated by fsreport
available for the relay operator
and metrics for prometheus are generated by mtail.

Closes <#431>

Author: link2xt

ARCHITECTURE.md

@@ -17,9 +17,7 @@ graph LR;
     nginx-internal --- autoconfig.xml;
     certs-nginx[("`TLS certs
     /var/lib/acme`")] --> nginx-internal;
-    cron --- chatmail-metrics;
     cron --- acmetool;
-    chatmail-metrics --- website;
     acmetool --> certs[("`TLS certs
     /var/lib/acme`")];
     nginx-external --- |993|dovecot;

README.md

@@ -224,9 +224,6 @@ A short overview of `chatmaild` services:
   is a small bot for test purposes.
   It simply echoes back messages from users.
 
-- [`chatmail-metrics`](https://github.com/chatmail/relay/blob/main/chatmaild/src/chatmaild/metrics.py)
-  collects some metrics and displays them at `https://example.org/metrics`.
-
 ### Home page and getting started for users
 
 `cmdeploy run` also creates default static web pages and deploys them

chatmaild/pyproject.toml

@@ -26,7 +26,6 @@ doveauth = "chatmaild.doveauth:main"
 chatmail-metadata = "chatmaild.metadata:main"
 filtermail = "chatmaild.filtermail:main"
 echobot = "chatmaild.echo:main"
-chatmail-metrics = "chatmaild.metrics:main"
 chatmail-expire = "chatmaild.expire:main"
 chatmail-fsreport = "chatmaild.fsreport:main"
 lastlogin = "chatmaild.lastlogin:main"

chatmaild/src/chatmaild/metrics.py

@@ -108,16 +108,13 @@ def _install_remote_venv_with_chatmaild(config) -> None:
         ],
     )
 
-    files.template(
-        src=importlib.resources.files(__package__).joinpath("metrics.cron.j2"),
-        dest="/etc/cron.d/chatmail-metrics",
-        user="root",
-        group="root",
-        mode="644",
-        config={
-            "mailboxes_dir": config.mailboxes_dir,
-            "execpath": f"{remote_venv_dir}/bin/chatmail-metrics",
-        },
+    files.file(
+        path="/etc/cron.d/chatmail-metrics",
+        present=False,
+    )
+    files.file(
+        path="/var/www/html/metrics",
+        present=False,
     )
 
     # install systemd units

chatmaild/src/chatmaild/tests/test_metrics.py

@@ -76,10 +76,6 @@ http {
 			try_files $uri $uri/ =404;
 		}
 
-		location /metrics {
-			default_type text/plain;
-		}
-
 		location /new {
 			if ($request_method = GET) {
 				# Redirect to Delta Chat,