@java.lang.Override
      public boolean containsAttributeMap(java.lang.String key) {
        if (key == null) {
          throw new NullPointerException("map key");
        }
        return internalGetAttributeMap().ensureBuilderMap().containsKey(key);
      }
<pre>
A set of attributes. Each attribute's key can be up to 128 bytes
long. The value can be a string up to 256 bytes, a signed 64-bit integer,
or the boolean values `true` or `false`. For example:

    "/instance_id": { "string_value": { "value": "my-instance" } }
    "/http/request_bytes": { "int_value": 300 }
    "abc.com/myattribute": { "bool_value": false }
</pre>

<code>map&lt;string, .google.devtools.cloudtrace.v2.AttributeValue&gt; attribute_map = 1;
</code>
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/Span.java