Update about tracing

README.md

@@ -440,6 +440,16 @@ Force all steps to run.
 force: true
 ```
 
+### `trace:`
+
+Add tokens for tracing to headers and queries by default.
+
+Currently, HTTP runner, gRPC runner and DB runner are supported.
+
+``` yaml
+trace: true
+```
+
 ### `loop:`
 
 Loop setting for runbook.
@@ -656,6 +666,7 @@ steps:
             application/json:             # Content-Type specification. In this case, it is "Content-Type: application/json"
               username: alice
               password: passw0rd
+          trace: false                    # add `X-Runn-Trace` header to HTTP request for tracing
     test: |                               # test for current step
       current.res.status == 201
 ```
@@ -752,6 +763,15 @@ runners:
     # skipVerify: false
 ```
 
+#### Add `X-Runn-Trace` header to HTTP request for tracing
+
+``` yaml
+runners:
+  myapi:
+    endpoint: https://api.github.com
+    trace: true
+```
+
 ### gRPC Runner: Do gRPC request
 
 Use `grpc://` scheme to specify gRPC Runner.
@@ -772,6 +792,7 @@ steps:
           name: alice
           num: 3
           request_time: 2022-06-25T05:24:43.861872Z
+        trace: false                                  # add `x-runn-trace` header to gRPC request for tracing
   -
     desc: Request using Server streaming RPC
     greq:
@@ -877,6 +898,15 @@ are recorded with the following structure.
         num: 32                                    # current.res.messages[0].num
 ```
 
+#### Add `x-runn-trace` header to gRPC request for tracing
+
+``` yaml
+runners:
+  greq:
+    addr: grpc.example.com:8080
+    trace: true
+```
+
 ### DB Runner: Query a database
 
 Use dsn (Data Source Name) to specify DB Runner.
@@ -891,6 +921,7 @@ steps:
     desc: Select users            # description of step
     db:                           # key to identify the runner. In this case, it is DB Runner.
       query: SELECT * FROM users; # query to execute
+      trace: false                # add comment with trace token to query for tracing
 ```
 
 See [testdata/book/db.yml](testdata/book/db.yml).
@@ -924,6 +955,15 @@ otherwise it records `last_insert_id` and `rows_affected` .
   rows_affected: 1  # current.rows_affected
 ```
 
+#### Add comment with trace token to query for tracing
+
+``` yaml
+runners:
+  db:
+    dsn: mysql://dbuser:dbpass@hostname:3306/dbname
+    trace: true
+``
+
 #### Support Databases
 
 **PostgreSQL:**

option.go

@@ -655,7 +655,7 @@ func Force(enable bool) Option {
 	}
 }
 
-// Trace - Trace all steps by default.
+// Trace - Add tokens for tracing to headers and queries by default.
 func Trace(enable bool) Option {
 	return func(bk *book) error {
 		if !bk.trace {