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

Log field, metric, action and event names now say what they count
and, for timings, the unit. Package internal/waf is internal/coreruleset.

Model: opus-5-5

internal/discriminator/history_test.go

@@ -100,8 +100,8 @@ func TestOwnEndpointsAreNotInTheHistory(t *testing.T) {
 
 	s, _, server := startWithClock(t, "", map[string]string{metricsToken: token})
 
-	s.adminRequest("", http.MethodGet, discriminator.HealthPath, "", http.StatusOK)
-	s.adminRequest("", http.MethodGet, discriminator.MetricsPath, "",
+	s.ownEndpointRequest("", http.MethodGet, discriminator.HealthPath, "", http.StatusOK)
+	s.ownEndpointRequest("", http.MethodGet, discriminator.MetricsPath, "",
 		http.StatusUnauthorized)
 	s.scrape()