Metrics data is stored as structure, HTTP requests logging, got rid of context.

Metrics data now stored as structures. This is a first step for autodiscovery
helping for NMSes.

HTTP requests now logged.

Got rid of context.Context for getting metric data in applications
because context.Context is useless here.

internal/common/context_keys.go

@@ -1,11 +0,0 @@
-package common
-
-// ContextKey is a type of context.Context keys.
-type ContextKey string
-
-const (
-	// ContextKeyApplication specifies that returned value is a name of application.
-	ContextKeyApplication ContextKey = "applicationName"
-	// ContextKeyMetric specifies that returned value is a name of metric of application.
-	ContextKeyMetric ContextKey = "metricName"
-)

internal/common/http_handler.go

@@ -1,6 +1,6 @@
 package common
 
-import "context"
+import "go.dev.pztrn.name/metricator/internal/models"
 
 // HTTPHandlerFunc describes signature of HTTP requests handling function.
-type HTTPHandlerFunc func(context.Context) string
+type HTTPHandlerFunc func(*models.RequestInfo) string