[breaking-change] Remove health endpoint handler and renumber metrics.

The previous commit has eliminated any way to use `ServeHealth()`,
but kept it around to not introduce breaking changes. This one has
no such constraint.

conf/config.example.toml

@@ -7,8 +7,7 @@ log-format = "datetime+message"
 # Use "-" to disable the handler.
 pages = "tcp/:3000"
 caddy = "tcp/:3001"
-health = "tcp/:3002"
-metrics = "tcp/:3003"
+metrics = "tcp/:3002"
 
 [[wildcard]] # non-default section
 domain = "codeberg.page"

src/config.go

@@ -47,8 +47,7 @@ type Config struct {
 type ServerConfig struct {
 	Pages   string `toml:"pages" default:"tcp/:3000"`
 	Caddy   string `toml:"caddy" default:"tcp/:3001"`
-	Health  string `toml:"health" default:"tcp/:3002"`
-	Metrics string `toml:"metrics" default:"tcp/:3003"`
+	Metrics string `toml:"metrics" default:"tcp/:3002"`
 }
 
 type WildcardConfig struct {

src/health.go

@@ -1,20 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"net/http"
-)
-
-func ServeHealth(w http.ResponseWriter, r *http.Request) {
-	switch r.URL.Path {
-	case "/":
-		w.WriteHeader(http.StatusOK)
-		fmt.Fprintln(w, "ok")
-
-	case "/panic":
-		panic("explicit panic request")
-
-	default:
-		http.Error(w, "not found", http.StatusNotFound)
-	}
-}

src/main.go

@@ -168,7 +168,6 @@ func main() {
 		// just 0.5s later.
 		pagesListener := listen("pages", config.Server.Pages)
 		caddyListener := listen("caddy", config.Server.Caddy)
-		healthListener := listen("health", config.Server.Health)
 		metricsListener := listen("metrics", config.Server.Metrics)
 
 		if err := ConfigureBackend(&config.Storage); err != nil {
@@ -181,7 +180,6 @@ func main() {
 
 		go serve(pagesListener, http.HandlerFunc(ServePages))
 		go serve(caddyListener, http.HandlerFunc(ServeCaddy))
-		go serve(healthListener, http.HandlerFunc(ServeHealth))
 		go serve(metricsListener, promhttp.Handler())
 
 		if config.Insecure {