Agent naming (#330)

* Add Metadata.name to Agent config
* Use metadata.name to give the Agent a name
* Add the AgentName parameter to all log entries
* This is useful for being to filter the logs associated with a
particular experiment.

Fix #280

---------

Co-authored-by: Jeremy Lewi <jeremy+github@lewi.us>
Co-authored-by: standard-input[bot] <183254018+standard-input[bot]@users.noreply.github.com>

app/pkg/application/app.go

@@ -251,8 +251,8 @@ func (a *App) SetupLogging(logToFile bool) error {
 	newLogger := zap.New(core)
 	// Record the caller of the log message
 	newLogger = newLogger.WithOptions(zap.AddCaller())
+	newLogger = newLogger.With(zap.String("agentName", a.Config.Metadata.Name))
 	zap.ReplaceGlobals(newLogger)
-
 	return nil
 }
 

app/pkg/config/config.go

@@ -76,6 +76,8 @@ type Config struct {
 
 	// configFile is the configuration file used. It is
 	configFile string
+
+	Metadata api.Metadata `json:"metadata,omitempty" yaml:"metadata,omitempty"`
 }
 
 type LearnerConfig struct {
@@ -223,6 +225,14 @@ func (c *Config) GetModel() string {
 	return c.Agent.Model
 }
 
+// GetAgentName returns the name of the agent from the configuration.
+func (c *Config) GetAgentName() string {
+	if c.Metadata.Name == "" {
+		return ""
+	}
+	return c.Metadata.Name
+}
+
 func (c *Config) GetLogDir() string {
 	if c.Logging.LogDir != "" {
 		return c.Logging.LogDir