Add meta_struct and stack trace collection

[vpellan]

What does this PR do?

This PR adds meta_struct and stack trace collection support

Motivation:

Stack trace collection is required for exploit prevention. meta_struct is required for stack trace collection

Change log entry

None.

Additional Notes:

How to test the change?

[datadog-datadog-prod-us1]

Datadog Report

Branch report: vpellan/stack-trace-collection
Commit report: 77e9969
Test service: dd-trace-rb

❌ 5 Failed (0 Known Flaky), 22064 Passed, 1476 Skipped, 5m 23.46s Total Time

❌ Failed Tests (5)

• Datadog::Tracing::Span#to_hash is expected to eq {:error=>0, :meta=>{}, :metrics=>{}, :name=>"my.span", :parent_id=>0, :resource=>"my.span", :service=>nil, :span_id=>34, :span_links=>[], :trace_id=>12, :type=>nil} - rspec - Details

  Expand for error

   expected: {:error=>0, :meta=>{}, :metrics=>{}, :name=>"my.span", :parent_id=>0, :resource=>"my.span", :service=>nil, :span_id=>34, :span_links=>[], :trace_id=>12, :type=>nil}
        got: {:error=>0, :meta=>{}, :meta_struct=>{}, :metrics=>{}, :name=>"my.span", :parent_id=>0, :resource=>"my.span", :service=>nil, :span_id=>34, :span_links=>[], :trace_id=>12, :type=>nil}
   
   (compared using ==)
   
   Diff:
   @@ -1,5 +1,6 @@
    :error => 0,
    :meta => {},
   +:meta_struct => {},
   ...
  

• Datadog::Tracing::Span#to_hash is expected to eq {:error => 0, :meta => {}, :metrics => {}, :name => "my.span", :parent_id => 0, :resource => "my.span", :service => nil, :span_id => 34, :span_links => [], :trace_id => 12, :type => nil} - rspec

• Datadog::Tracing::Transport::SerializableTrace#to_msgpack behaves like serialize all fields contains all fields - rspec - Details

  Expand for error

   expected collection contained:  ["error", "meta", "metrics", "name", "parent_id", "resource", "service", "span_id", "span_links", "trace_id", "type"]
   actual collection contained:    ["error", "meta", "meta_struct", "metrics", "name", "parent_id", "resource", "service", "span_id", "span_links", "trace_id", "type"]
   the extra elements were:        ["meta_struct"]
   
   Failure/Error: expect(span.keys).to match_array(expected)
   
     expected collection contained:  ["error", "meta", "metrics", "name", "parent_id", "resource", "service", "span_id", "span_links", "trace_id", "type"]
     actual collection contained:    ["error", "meta", "meta_struct", "metrics", "name", "parent_id", "resource", "service", "span_id", "span_links", "trace_id", "type"]
     the extra elements were:        ["meta_struct"]
   Shared Example Group: "serialize all fields" called from ./spec/datadog/tracing/transport/serializable_trace_spec.rb:223
   ...
  

• Datadog::Tracing::Transport::SerializableTrace#to_msgpack when given span events behaves like serialize all fields contains all fields - rspec - Details

  Expand for error

   expected collection contained:  ["error", "meta", "metrics", "name", "parent_id", "resource", "service", "span_id", "span_links", "trace_id", "type"]
   actual collection contained:    ["error", "meta", "meta_struct", "metrics", "name", "parent_id", "resource", "service", "span_id", "span_links", "trace_id", "type"]
   the extra elements were:        ["meta_struct"]
   
   Failure/Error: expect(span.keys).to match_array(expected)
   
     expected collection contained:  ["error", "meta", "metrics", "name", "parent_id", "resource", "service", "span_id", "span_links", "trace_id", "type"]
     actual collection contained:    ["error", "meta", "meta_struct", "metrics", "name", "parent_id", "resource", "service", "span_id", "span_links", "trace_id", "type"]
     the extra elements were:        ["meta_struct"]
   Shared Example Group: "serialize all fields" called from ./spec/datadog/tracing/transport/serializable_trace_spec.rb:191
   ...
  

• Datadog::Tracing::Transport::SerializableTrace#to_msgpack when given span events when native events are supported behaves like serialize all fields contains all fields - rspec - Details

  Expand for error

   expected collection contained:  ["error", "meta", "metrics", "name", "parent_id", "resource", "service", "span_events", "span_id", "span_links", "trace_id", "type"]
   actual collection contained:    ["error", "meta", "meta_struct", "metrics", "name", "parent_id", "resource", "service", "span_events", "span_id", "span_links", "trace_id", "type"]
   the extra elements were:        ["meta_struct"]
   
   Failure/Error: expect(span.keys).to match_array(expected)
   
     expected collection contained:  ["error", "meta", "metrics", "name", "parent_id", "resource", "service", "span_events", "span_id", "span_links", "trace_id", "type"]
     actual collection contained:    ["error", "meta", "meta_struct", "metrics", "name", "parent_id", "resource", "service", "span_events", "span_id", "span_links", "trace_id", "type"]
     the extra elements were:        ["meta_struct"]
   Shared Example Group: "serialize all fields" called from ./spec/datadog/tracing/transport/serializable_trace_spec.rb:219
   ...
  

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-01-14 16:02:55

Comparing candidate commit 77e9969 in PR branch vpellan/stack-trace-collection with baseline commit 5235204 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 31 metrics, 2 unstable metrics.