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<div><h1 class="title"><a id="id-1"></a>Metadata</h1><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.2/docs/metadata-api.asciidoc">edit</a></div>
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<div class="position-relative"><h2 class="title"><a id="metadata-api"></a>Metadata</h2><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.2/docs/metadata-api.asciidoc">edit</a></div>
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<p>Every new connection to the APM Server starts with a <code class="literal">metadata</code> stanza.
This provides general metadata concerning the other objects in the stream.</p>
<p>Rather than send this metadata information from the agent multiple times,
the APM Server hangs on to this information and applies it to other objects in the stream as necessary.</p>
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<p>Metadata is stored under <code class="literal">context</code> when viewing documents in Elasticsearch.</p>
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<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
<a class="xref" href="metadata-api.html#kubernetes-data" title="Kubernetes data">Kubernetes data</a>
</li>
<li class="listitem">
<a class="xref" href="metadata-api.html#metadata-schema" title="Metadata Schema">Metadata Schema</a>
</li>
<li class="listitem">
<a class="xref" href="metadata-api.html#metadata-service-schema" title="Service Schema">Service Schema</a>
</li>
<li class="listitem">
<a class="xref" href="metadata-api.html#metadata-process-schema" title="Process Schema">Process Schema</a>
</li>
<li class="listitem">
<a class="xref" href="metadata-api.html#metadata-system-schema" title="System Schema">System Schema</a>
</li>
<li class="listitem">
<a class="xref" href="metadata-api.html#metadata-user-schema" title="User Schema">User Schema</a>
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<div class="position-relative"><h4><a id="kubernetes-data"></a>Kubernetes data</h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.2/docs/metadata-api.asciidoc">edit</a></div>
<p>APM agents automatically read kubernetes data and send it to the APM Server.
In most instances, agents are able to read this data from inside the container.
If this is not the case, or if you wish to override this data, you can set environment variables for the agents to read.
These environment variable are set via the kubernetes <a href="https://kubernetes.io/docs/tasks/inject-data-application/environment-variable-expose-pod-information/#use-pod-fields-as-values-for-environment-variables" class="ulink" target="_top">Downward API</a>.
Here&#8217;s how you would add the environment variables to your kubernetes pod spec:</p>
<div class="pre_wrapper lang-yaml">
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<pre class="programlisting prettyprint lang-yaml">         - name: KUBERNETES_NODE_NAME
            valueFrom:
              fieldRef:
                fieldPath: spec.nodeName
          - name: KUBERNETES_POD_NAME
            valueFrom:
              fieldRef:
                fieldPath: metadata.name
          - name: KUBERNETES_NAMESPACE
            valueFrom:
              fieldRef:
                fieldPath: metadata.namespace
          - name: KUBERNETES_POD_UID
            valueFrom:
              fieldRef:
                fieldPath: metadata.uid</pre>
</div>
<p>The table below maps these environment variables to the APM metadata event field:</p>
<div class="informaltable">
<table border="1" cellpadding="4px">
<colgroup>
<col class="col_1"/>
<col class="col_2"/>
</colgroup>
<thead>
<tr>
<th align="left" valign="top">Environment variable</th>
<th align="left" valign="top">Metadata field name</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top"><p>KUBERNETES_NODE_NAME</p></td>
<td align="left" valign="top"><p>system.kubernetes.node.name</p></td>
</tr>
<tr>
<td align="left" valign="top"><p>KUBERNETES_POD_NAME</p></td>
<td align="left" valign="top"><p>system.kubernetes.pod.name</p></td>
</tr>
<tr>
<td align="left" valign="top"><p>KUBERNETES_NAMESPACE</p></td>
<td align="left" valign="top"><p>system.kubernetes.namespace</p></td>
</tr>
<tr>
<td align="left" valign="top"><p>KUBERNETES_POD_UID</p></td>
<td align="left" valign="top"><p>system.kubernetes.pod.uid</p></td>
</tr>
</tbody>
</table>
</div>
<div class="position-relative"><h4><a id="metadata-schema"></a>Metadata Schema</h4><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.2/docs/metadata-api.asciidoc">edit</a></div>
<p>The APM Server uses JSON Schema for validating requests. The specification for metadata is defined below:</p>
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<pre class="programlisting prettyprint lang-json">{
    "$id": "doc/spec/metadata.json",
    "title": "Metadata",
    "description": "Metadata concerning the other objects in the stream.",
    "type": ["object"],
    "properties": {
        "service": {
            "$ref": "service.json",
            "type": "object",
            "required": ["name", "agent"],
            "properties.name.type": "string",
            "properties.agent.type": "string",
            "properties.agent.required": ["name", "version"],
            "properties.agent.properties.name.type": "string",
            "properties.agent.properties.version.type": "string",
            "properties.runtime.required": ["name", "version"],
            "properties.runtime.properties.name.type": "string",
            "properties.runtime.properties.version.type": "string",
            "properties.language.required": ["name"],
            "properties.language.properties.name.type": "string"
        },
        "process": {
            "$ref": "process.json"
        },
        "system": {
            "$ref": "system.json"
        },
        "user": {
            "description": "Describes the authenticated User for a request.",
            "$ref": "user.json"
        },
        "labels": {
            "$ref": "tags.json"
        }
    },
    "required": ["service"]
}</pre>
</div>
<div class="position-relative"><h5><a id="metadata-service-schema"></a>Service Schema</h5><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.2/docs/metadata-api.asciidoc">edit</a></div>
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<pre class="programlisting prettyprint lang-json">{
    "$id": "doc/spec/service.json",
    "title": "Service",
    "type": ["object", "null"],
    "properties": {
        "agent": {
            "description": "Name and version of the Elastic APM agent",
            "type": ["object", "null"],
            "properties": {
                "name": {
                    "description": "Name of the Elastic APM agent, e.g. \"Python\"",
                    "type": ["string", "null"],
                    "maxLength": 1024
                },
                "version": {
                    "description": "Version of the Elastic APM agent, e.g.\"1.0.0\"",
                    "type": ["string", "null"],
                    "maxLength": 1024
                },
                "ephemeral_id": {
                    "description": "Free format ID used for metrics correlation by some agents",
                    "type": ["string", "null"],
                    "maxLength": 1024
                }
            }
        },
        "framework": {
            "description": "Name and version of the web framework used",
            "type": ["object", "null"],
            "properties": {
                "name": {
                    "type": ["string", "null"],
                    "maxLength": 1024
                },
                "version": {
                    "type": ["string", "null"],
                    "maxLength": 1024
                }
            }
        },
        "language": {
            "description": "Name and version of the programming language used",
            "type": ["object", "null"],
            "properties": {
                "name": {
                    "type": ["string", "null"],
                    "maxLength": 1024
                },
                "version": {
                    "type": ["string", "null"],
                    "maxLength": 1024
                }
            }
        },
        "name": {
            "description": "Immutable name of the service emitting this event",
            "type": ["string", "null"],
            "pattern": "^[a-zA-Z0-9 _-]+$",
            "maxLength": 1024
        },
        "environment": {
            "description": "Environment name of the service, e.g. \"production\" or \"staging\"",
            "type": ["string", "null"],
            "maxLength": 1024
        },
        "runtime": {
            "description": "Name and version of the language runtime running this service",
            "type": ["object", "null"],
            "properties": {
                "name": {
                    "type": ["string", "null"],
                    "maxLength": 1024
                },
                "version": {
                    "type": ["string", "null"],
                    "maxLength": 1024
                }
            }
        },
        "version": {
            "description": "Version of the service emitting this event",
            "type": ["string", "null"],
            "maxLength": 1024
        }
    }
}</pre>
</div>
<div class="position-relative"><h5><a id="metadata-process-schema"></a>Process Schema</h5><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.2/docs/metadata-api.asciidoc">edit</a></div>
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<pre class="programlisting prettyprint lang-json">{
  "$id": "doc/spec/process.json",
  "title": "Process",
  "type": ["object", "null"],
  "properties": {
      "pid": {
          "description": "Process ID of the service",
          "type": ["integer"]
      },
      "ppid": {
          "description": "Parent process ID of the service",
          "type": ["integer", "null"]
      },
      "title": {
          "type": ["string", "null"],
          "maxLength": 1024
      },
      "argv": {
        "description": "Command line arguments used to start this process",
        "type": ["array", "null"],
        "minItems": 0,
        "items": {
           "type": "string"
        }
    }
  },
  "required": ["pid"]
}</pre>
</div>
<div class="position-relative"><h5><a id="metadata-system-schema"></a>System Schema</h5><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.2/docs/metadata-api.asciidoc">edit</a></div>
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<pre class="programlisting prettyprint lang-json">{
    "$id": "doc/spec/system.json",
    "title": "System",
    "type": ["object", "null"],
    "properties": {
        "architecture": {
            "description": "Architecture of the system the agent is running on.",
            "type": ["string", "null"],
            "maxLength": 1024
        },
        "hostname": {
            "description": "Hostname of the system the agent is running on.",
            "type": ["string", "null"],
            "maxLength": 1024
        },
        "platform": {
            "description": "Name of the system platform the agent is running on.",
            "type": ["string", "null"],
            "maxLength": 1024
        },
        "container": {
            "properties": {
                "id" : {
                    "description": "Container ID",
                    "type": ["string"],
                    "maxLength": 1024
                }
            },
            "required": ["id"]
        },
        "kubernetes": {
            "properties": {
                "namespace": {
                    "description": "Kubernetes namespace",
                    "type": ["string", "null"],
                    "maxLength": 1024
                },
                "pod":{
                    "properties": {
                        "name": {
                            "description": "Kubernetes pod name",
                            "type": ["string", "null"],
                            "maxLength": 1024
                        },
                        "uid": {
                            "description": "Kubernetes pod uid",
                            "type": ["string", "null"],
                            "maxLength": 1024
                        }
                    }
                },
                "node":{
                    "properties": {
                        "name": {
                            "description": "Kubernetes node name",
                            "type": ["string", "null"],
                            "maxLength": 1024
                        }
                    }
                }
            }
        }
    }
}</pre>
</div>
<div class="position-relative"><h5><a id="metadata-user-schema"></a>User Schema</h5><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/7.2/docs/metadata-api.asciidoc">edit</a></div>
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<pre class="programlisting prettyprint lang-json">{
    "$id": "docs/spec/user.json",
    "title": "User",
    "type": ["object", "null"],
    "properties": {
        "id": {
            "description": "Identifier of the logged in user, e.g. the primary key of the user",
            "type": ["string", "integer", "null"],
            "maxLength": 1024
        },
        "email": {
            "description": "Email of the logged in user",
            "type": ["string", "null"],
            "maxLength": 1024
        },
        "username": {
            "description": "The username of the logged in user",
            "type": ["string", "null"],
            "maxLength": 1024
        }
    }
}</pre>
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