feat: create tracing.SlogSink for storing logs as span events (#4962)

cli/deployment/config.go

@@ -295,6 +295,11 @@ func newConfig() *codersdk.DeploymentConfig {
 				Flag:   "trace-honeycomb-api-key",
 				Secret: true,
 			},
+			CaptureLogs: &codersdk.DeploymentConfigField[bool]{
+				Name:  "Capture Logs in Traces",
+				Usage: "Enables capturing of logs as events in traces. This is useful for debugging, but may result in a very large amount of events being sent to the tracing backend which may incur significant costs. If the verbose flag was supplied, debug-level logs will be included.",
+				Flag:  "trace-logs",
+			},
 		},
 		SecureAuthCookie: &codersdk.DeploymentConfigField[bool]{
 			Name:  "Secure Auth Cookie",

cli/server.go

@@ -88,6 +88,9 @@ func Server(vip *viper.Viper, newAPI func(context.Context, *coderd.Options) (*co
 			if ok, _ := cmd.Flags().GetBool(varVerbose); ok {
 				logger = logger.Leveled(slog.LevelDebug)
 			}
+			if cfg.Trace.CaptureLogs.Value {
+				logger = logger.AppendSinks(tracing.SlogSink{})
+			}
 
 			// Main command context for managing cancellation
 			// of running services.
@@ -126,7 +129,7 @@ func Server(vip *viper.Viper, newAPI func(context.Context, *coderd.Options) (*co
 				shouldCoderTrace = cfg.Telemetry.Trace.Value
 			}
 
-			if cfg.Trace.Enable.Value || shouldCoderTrace {
+			if cfg.Trace.Enable.Value || shouldCoderTrace || cfg.Trace.HoneycombAPIKey.Value != "" {
 				sdkTracerProvider, closeTracing, err := tracing.TracerProvider(ctx, "coderd", tracing.TracerOpts{
 					Default:   cfg.Trace.Enable.Value,
 					Coder:     shouldCoderTrace,

cli/testdata/coder_server_--help.golden

@@ -188,6 +188,14 @@ Flags:
       --trace-honeycomb-api-key string               Enables trace exporting to Honeycomb.io
                                                      using the provided API Key.
                                                      Consumes $CODER_TRACE_HONEYCOMB_API_KEY
+      --trace-logs                                   Enables capturing of logs as events in
+                                                     traces. This is useful for debugging, but
+                                                     may result in a very large amount of
+                                                     events being sent to the tracing backend
+                                                     which may incur significant costs. If the
+                                                     verbose flag was supplied, debug-level
+                                                     logs will be included.
+                                                     Consumes $CODER_TRACE_CAPTURE_LOGS
       --wildcard-access-url string                   Specifies the wildcard hostname to use
                                                      for workspace applications in the form
                                                      "*.example.com".