Name log fields, metrics and the Core Rule Set package for what they are (closes #192)

The first half of the naming audit: names now say what they are. `internal/waf` is `internal/coreruleset`. Log fields, the action `blocked_by_core_rule_set`, the metric and the alert event say Core Rule Set. Timings end `_ms`. Percentages say of what, as `rate_limit_percent` and `bytes_limit_percent`. Setting names follow in #234.

Judgement call: `blocked_by_core_rule_set`, not the audit's `core_rule_set_blocked`, to match `blocked_by_block_rule`.
Trips a reader: an existing state file holding `waf_blocked` or the anomaly scope `watch` stops the start and must be removed. `SWW_ALERT_EVENTS` listing `waf_block` must list `core_rule_set_match`.

Model: opus-5-5

internal/discriminator/admin_test.go

@@ -40,7 +40,7 @@ func TestAdminEndpointsAreOffWhileTheTokenIsUnset(t *testing.T) {
 	// An empty token does not match the unset one either.
 	for _, authorization := range []string{adminBearer, bearer, "Bearer ", ""} {
 		for _, e := range adminEndpoints() {
-			s.adminRequest(authorization, e.method, e.path, e.body, http.StatusNotFound)
+			s.ownEndpointRequest(authorization, e.method, e.path, e.body, http.StatusNotFound)
 		}
 	}
 
@@ -67,7 +67,7 @@ func TestAdminEndpointsNeedTheAdminToken(t *testing.T) {
 		for _, authorization := range []string{
 			"", bearer, "Bearer " + strings.ToUpper(adminSecret), "Basic " + adminSecret,
 		} {
-			got := s.adminRequest(authorization, e.method, e.path, e.body,
+			got := s.ownEndpointRequest(authorization, e.method, e.path, e.body,
 				http.StatusUnauthorized)
 			if got.header.Get("WWW-Authenticate") != "Bearer" {
 				t.Errorf("%s %s with %q was answered without WWW-Authenticate: Bearer",
@@ -329,7 +329,7 @@ func TestAdminEndpointsNeedTheTokenInObserveMode(t *testing.T) {
 	})
 
 	for _, e := range adminEndpoints() {
-		s.adminRequest("", e.method, e.path, e.body, http.StatusUnauthorized)
+		s.ownEndpointRequest("", e.method, e.path, e.body, http.StatusUnauthorized)
 	}
 
 	if held := server.Ledger.Snapshot(); len(held) != 0 {
@@ -356,16 +356,16 @@ func adminEndpoints() []adminEndpoint {
 
 // admin sends a request with method for path, with body, to discriminator's own
 // address, with the admin token, and checks that it is answered with status, its
-// log line's action admin. It returns the answer.
+// log line's action own_endpoint. It returns the answer.
 func (s *sender) admin(method, path, body string, status int) answer {
 	s.t.Helper()
 
-	return s.adminRequest(adminBearer, method, path, body, status)
+	return s.ownEndpointRequest(adminBearer, method, path, body, status)
 }
 
-// adminRequest is admin with authorization as the request's Authorization header
-// unless it is "".
-func (s *sender) adminRequest(
+// ownEndpointRequest is admin with authorization as the request's Authorization
+// header unless it is "".
+func (s *sender) ownEndpointRequest(
 	authorization, method, path, body string, status int,
 ) answer {
 	s.t.Helper()
@@ -380,7 +380,7 @@ func (s *sender) adminRequest(
 
 	line := s.out.endedLines(s.t, s.sent+1)[s.sent]
 	s.sent++
-	wantLine(s.t, line, status, requestlog.ActionAdmin)
+	wantLine(s.t, line, status, requestlog.ActionOwnEndpoint)
 
 	return got
 }