Instrumentation: Add support for instrumenting database queries (#66022)

Signed-off-by: bergquist <carl.bergquist@gmail.com>
Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>

pkg/setting/setting.go

@@ -519,6 +519,12 @@ type Cfg struct {
 	GRPCServerTLSConfig *tls.Config
 
 	CustomResponseHeaders map[string]string
+
+	// DatabaseInstrumentQueries is used to decide if database queries
+	// should be instrumented with metrics, logs and traces.
+	// This needs to be on the global object since its used in the
+	// sqlstore package and HTTP middlewares.
+	DatabaseInstrumentQueries bool
 }
 
 // AddChangePasswordLink returns if login form is disabled or not since
@@ -1189,6 +1195,9 @@ func (cfg *Cfg) Load(args CommandLineArgs) error {
 
 	cfg.LogConfigSources()
 
+	databaseSection := iniFile.Section("database")
+	cfg.DatabaseInstrumentQueries = databaseSection.Key("instrument_queries").MustBool(false)
+
 	return nil
 }