[exporter/elasticsearch] OTel mode serialization #33290

aleksmaus · 2024-05-29T15:26:34Z

Description:

Implements OTel (OpenTelemetry-native) mode serialization for elasticsearch exporter.
This is an initial cut in order to get the discussion going.
This is approach was tested as internal POC.

It leverages Elasticsearch "passthrough" fields mapping initially introduced in Elasticsearch 8.13 allowing users to query the document/scope/resources attributes as top level fields, making the ECS queries compatible with OTel sematic convention schema. Another benefit is the simplicity of conversion of stored document from Elasticsearch back to Otel data model format.

The document/scope/resources attributes are dynamically mapped and stored as flattened keys.

Here is an example of index template mappings with "passthrough" fields:

PUT _index_template/logs_otel
{
  "priority": 250,
  "template": {
    "settings": {
      "index": {
        "lifecycle": {
          "name": "logs"
        },
        "codec": "best_compression",
        "mapping": {
          "ignore_malformed": "true"
        }
      }
    },
    "mappings": {
      "_source": {
        "enabled": true
      },
      "date_detection": false,
      "dynamic": "strict",
      "dynamic_templates": [
        {
          "all_strings_to_keywords": {
            "mapping": {
              "ignore_above": 1024,
              "type": "keyword"
            },
            "match_mapping_type": "string"
          }
        },
        {
          "complex_attributes": {
            "path_match": [
              "resource.attributes.*",
              "scope.attributes.*",
              "attributes.*"
            ],
            "match_mapping_type": "object",
            "mapping": {
              "type": "flattened"
            }
          }
        }
      ],
      "properties": {
        "@timestamp": {
          "type": "date_nanos",
          "ignore_malformed": false
        },
        "data_stream": {
          "type": "object",
          "properties": {
            "type": {
              "type": "constant_keyword"
            },
            "dataset": {
              "type": "constant_keyword"
            },
            "namespace": {
              "type": "constant_keyword"
            }
          }
        },
        "observed_timestamp": {
          "type": "date_nanos",
          "ignore_malformed": true
        },
        "severity_number": {
          "type": "long"
        },
        "severity_text": {
          "type": "keyword"
        },
        "body_text": {
          "type": "match_only_text"
        },
        "body_structured": {
          "type": "flattened"
        },
        "attributes": {
          "type": "passthrough",
          "dynamic": true,
          "priority": 2
        },
        "dropped_attributes_count": {
          "type": "long"
        },
        "trace_flags": {
          "type": "byte"
        },
        "trace_id": {
          "type": "keyword"
        },
        "span_id": {
          "type": "keyword"
        },
        "scope": {
          "properties": {
            "name": {
              "type": "keyword"
            },
            "version": {
              "type": "keyword"
            },
            "attributes": {
              "type": "passthrough",
              "dynamic": true,
              "priority": 1
            },
            "dropped_attributes_count": {
              "type": "long"
            },
            "schema_url": {
              "type": "keyword"
            }
          }
        },
        "resource": {
          "properties": {
            "dropped_attributes_count": {
              "type": "long"
            },
            "schema_url": {
              "type": "keyword"
            },
            "attributes": {
              "type": "passthrough",
              "dynamic": true,
              "priority": 0
            }
          }
        }
      }
    }
  },
  "index_patterns": [
    "logs-*.otel-*"
  ],
  "data_stream": {}
}

Here is an example of the auditd document in Elasticsearch abbreviated:

{
    "@timestamp": "2024-05-29T13:30:25.085926000Z",
    "attributes": {
        "foo": "bar",
        "some.bool": true
    },
    "body_structured": {
        "MESSAGE": "AVC apparmor=\"STATUS\" operation=\"profile_replace\" info=\"same as current profile, skipping\" profile=\"unconfined\" name=\"/usr/bin/evince-previewer\" pid=2702 comm=\"apparmor_parser\"",
        "SYSLOG_FACILITY": "4",
        "SYSLOG_IDENTIFIER": "audit",
        "_SOURCE_REALTIME_TIMESTAMP": "1716989425080000",
        "_TRANSPORT": "audit",
    },
    "dropped_attributes_count": 0,
    "observed_timestamp": "2024-05-29T14:49:26.534908898Z",
    "resource": {
        "attributes": {
            "data_stream.dataset": "auditd.otel",
            "data_stream.namespace": "default",
            "data_stream.type": "logs",
            "host.arch": "arm64",
            "host.cpu.cache.l2.size": 0,
            "host.cpu.family": "",
            "host.cpu.model.id": "0x000",
            "host.cpu.model.name": "",
            "host.cpu.stepping": "0",
            "host.cpu.vendor.id": "Apple",
            "host.id": "cae0e0147d454a80971b0b747c8b62b9",
            "host.ip": [
                "172.16.3.131",
                "fe80::20c:29ff:fe66:3012",
            "host.name": "lebuntu",
            "host.os.description": "Ubuntu 22.04.4 LTS (Jammy Jellyfish) (Linux lebuntu 5.15.0-107-generic #117-Ubuntu SMP Mon Apr 29 14:37:09 UTC 2024 aarch64)",
            "host.os.type": "linux",
            "os.description": "Ubuntu 22.04.4 LTS (Jammy Jellyfish) (Linux lebuntu 5.15.0-107-generic #117-Ubuntu SMP Mon Apr 29 14:37:09 UTC 2024 aarch64)",
            "os.type": "linux"
        },
        "dropped_attributes_count": 0,
        "schema_url": "https://opentelemetry.io/schemas/1.6.1"
    },
    "severity_number": 0,
    "trace_flags": 0
}

Here is an example of ECS compatible query that works on this Otel native schema:

GET logs-auditd.otel-default/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "match": {
            "host.name": "lebuntu"
          }
        }
      ]
    }
  }
}

Link to tracking Issue:
No tracking issue yet.

Testing:
Added unit test for OTel transformation.
Tested with journald OTel receiver.

Documentation:
No documentation is added yet.

felixbarny · 2024-06-06T13:56:21Z

Functionally, the PR looks good to me. The only missing piece is the data stream routing. Maybe a test case with complex (map, list) attributes could be useful. I'll defer the actual code review to folks more familiar with go and the code base.

github-actions · 2024-06-21T05:20:29Z

This PR was marked stale due to lack of activity. It will be closed in 14 days.

aleksmaus · 2024-06-24T19:16:56Z

Updated PR based on the some code review feedback. Added the data_stream routing support, that was initially implemented in Josh's POC per reviewer request.

aleksmaus · 2024-06-24T19:18:41Z

Don't have permissions to remove the Stale label. Please advise.

felixbarny · 2024-06-28T09:11:22Z

#33794 is doing some changes wrt. routing. After that is merged, please merge in the changes and make sure the same routing mechanism is used. Let us know if you think that would work.

aleksmaus · 2024-06-28T13:57:38Z

#33794 is doing some changes wrt. routing. After that is merged, please merge in the changes and make sure the same routing mechanism is used. Let us know if you think that would work.

Yeah, that why I mentioned in DM before that I didn't want to add the routing since the work was happening in that area. It's easy to rollback.

exporter/elasticsearchexporter/exporter.go

carsonip · 2024-07-10T15:38:23Z

exporter/elasticsearchexporter/internal/objmodel/objmodel.go

@@ -245,19 +245,19 @@ func (doc *Document) Dedup() {
 // Serialize writes the document to the given writer. The serializer will create nested objects if dedot is true.
 //
 // NOTE: The documented MUST be sorted if dedot is true.
-func (doc *Document) Serialize(w io.Writer, dedot bool) error {
+func (doc *Document) Serialize(w io.Writer, dedot bool, otel bool) error {


Do we have to change objmodel for otel mode? Is there a reason why it isn't done like https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/exporter/elasticsearchexporter/model.go#L124 where we just add the attributes under a key?

As far as I remember, at the time of implementing this feature, I stumbled on the issue where the document could only be serialized as completely flat from the root or "dedotted" (by default https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/exporter/elasticsearchexporter/factory.go#L80), all the comma separated properties were unwrapped into the nested object, which was not stored correctly "flattened" with the passthrough attributes in ES.

With OTel-native serialization the serialized document structure is a mix, needed to keep only the ".attributes*" flattened, while the rest of the document from the root is not flattened.

Let me know if anything changed in that area recently, this PR was open for some time.

Thanks for the context. I'm just learning about how passthrough field type works, and what you describe here makes sense. I wonder if it could be structured better in the code, but I don't have any good ideas at the moment and it is not a blocker.

Maybe it makes sense to revisit this once we remove the dedot option: #33772.

exporter/elasticsearchexporter/config.go

felixbarny

Other than a small suggestion for the docs, LGTM.
If Carson is happy with this, I think we can merge it.

exporter/elasticsearchexporter/README.md

Co-authored-by: Felix Barnsteiner <[email protected]>

aleksmaus · 2024-07-15T15:13:00Z

Accepted the README suggestion, merged the latest main

carsonip

thanks! changelog nit, otherwise lgtm

.chloggen/feature_elasticsearch_otel_model.yaml

Co-authored-by: Carson Ip <[email protected]>

aleksmaus · 2024-07-16T19:37:57Z

Accepted the suggestions, resolved the latest set of conflicts with main.

djaglowski · 2024-07-23T01:25:43Z

Please resolve CI failures and merge conflict

aleksmaus · 2024-07-23T12:39:00Z

Resolved conflicts

carsonip

=== Failed
=== FAIL: internal/objmodel TestDocument_Serialize_Otel/otel (0.00s)
    objmodel_test.go:387: 
                Error Trace:    /home/carson/projects/opentelemetry-collector-contrib/exporter/elasticsearchexporter/internal/objmodel/objmodel_test.go:387
                Error:          Not equal: 
                                expected: "{\"@timestamp\":\"2024-03-18T21:09:53.645578000Z\",\"attributes\":{\"auditd.log.op\":\"PAM:session_open\",\"auditd.log.record_type\":\"USER_START\",\"auditd.log.sequence\":6082,\"auditd.log.subj\":\"unconfined\",\"auditd.log.uid\":\"1000\"},\"resource\":{\"attributes\":{\"blah.num\":234,\"blah.str\":\"something\"}},\"scope\":{\"attributes\":{\"bar.one\":\"boo\",\"foo.two\":\"bar\"}}}"
                                actual  : "{\"@timestamp\":\"2024-03-18T21:09:53.645578000Z\",\"attributes\":{\"auditd.log.op\":\"PAM:session_open\",\"auditd.log.record_type\":\"USER_START\",\"auditd.log.sequence\":6082,\"auditd.log.subj\":\"unconfined\",\"auditd.log.uid\":\"1000\"},\"resource\":{\"attributes\":{\"blah\":{\"num\":234,\"str\":\"something\"}}},\"scope\":{\"attributes\":{\"bar\":{\"one\":\"boo\"},\"foo\":{\"two\":\"bar\"}}}}"
                                
                                Diff:
                                --- Expected
                                +++ Actual
                                @@ -1 +1 @@
                                -{"@timestamp":"2024-03-18T21:09:53.645578000Z","attributes":{"auditd.log.op":"PAM:session_open","auditd.log.record_type":"USER_START","auditd.log.sequence":6082,"auditd.log.subj":"unconfined","auditd.log.uid":"1000"},"resource":{"attributes":{"blah.num":234,"blah.str":"something"}},"scope":{"attributes":{"bar.one":"boo","foo.two":"bar"}}}
                                +{"@timestamp":"2024-03-18T21:09:53.645578000Z","attributes":{"auditd.log.op":"PAM:session_open","auditd.log.record_type":"USER_START","auditd.log.sequence":6082,"auditd.log.subj":"unconfined","auditd.log.uid":"1000"},"resource":{"attributes":{"blah":{"num":234,"str":"something"}}},"scope":{"attributes":{"bar":{"one":"boo"},"foo":{"two":"bar"}}}}
                Test:           TestDocument_Serialize_Otel/otel

=== FAIL: internal/objmodel TestDocument_Serialize_Otel (0.00s)

=== FAIL: internal/objmodel TestDocument_Serialize_Otel/otel (re-run 1) (0.00s)
    objmodel_test.go:387: 
                Error Trace:    /home/carson/projects/opentelemetry-collector-contrib/exporter/elasticsearchexporter/internal/objmodel/objmodel_test.go:387
                Error:          Not equal: 
                                expected: "{\"@timestamp\":\"2024-03-18T21:09:53.645578000Z\",\"attributes\":{\"auditd.log.op\":\"PAM:session_open\",\"auditd.log.record_type\":\"USER_START\",\"auditd.log.sequence\":6082,\"auditd.log.subj\":\"unconfined\",\"auditd.log.uid\":\"1000\"},\"resource\":{\"attributes\":{\"blah.num\":234,\"blah.str\":\"something\"}},\"scope\":{\"attributes\":{\"bar.one\":\"boo\",\"foo.two\":\"bar\"}}}"
                                actual  : "{\"@timestamp\":\"2024-03-18T21:09:53.645578000Z\",\"attributes\":{\"auditd.log.op\":\"PAM:session_open\",\"auditd.log.record_type\":\"USER_START\",\"auditd.log.sequence\":6082,\"auditd.log.subj\":\"unconfined\",\"auditd.log.uid\":\"1000\"},\"resource\":{\"attributes\":{\"blah\":{\"num\":234,\"str\":\"something\"}}},\"scope\":{\"attributes\":{\"bar\":{\"one\":\"boo\"},\"foo\":{\"two\":\"bar\"}}}}"
                                
                                Diff:
                                --- Expected
                                +++ Actual
                                @@ -1 +1 @@
                                -{"@timestamp":"2024-03-18T21:09:53.645578000Z","attributes":{"auditd.log.op":"PAM:session_open","auditd.log.record_type":"USER_START","auditd.log.sequence":6082,"auditd.log.subj":"unconfined","auditd.log.uid":"1000"},"resource":{"attributes":{"blah.num":234,"blah.str":"something"}},"scope":{"attributes":{"bar.one":"boo","foo.two":"bar"}}}
                                +{"@timestamp":"2024-03-18T21:09:53.645578000Z","attributes":{"auditd.log.op":"PAM:session_open","auditd.log.record_type":"USER_START","auditd.log.sequence":6082,"auditd.log.subj":"unconfined","auditd.log.uid":"1000"},"resource":{"attributes":{"blah":{"num":234,"str":"something"}}},"scope":{"attributes":{"bar":{"one":"boo"},"foo":{"two":"bar"}}}}
                Test:           TestDocument_Serialize_Otel/otel

@timestamp

**Description:** Implements OTel (OpenTelemetry-native) mode serialization for elasticsearch exporter. This is an initial cut in order to get the discussion going. This is approach was tested as internal POC. It leverages Elasticsearch ```"passthrough"``` fields mapping initially introduced in Elasticsearch 8.13 allowing users to query the document/scope/resources attributes as top level fields, making the ECS queries compatible with OTel sematic convention schema. Another benefit is the simplicity of conversion of stored document from Elasticsearch back to Otel data model format. The document/scope/resources attributes are dynamically mapped and stored as flattened keys. Here is an example of index template mappings with ```"passthrough"``` fields: ``` PUT _index_template/logs_otel { "priority": 250, "template": { "settings": { "index": { "lifecycle": { "name": "logs" }, "codec": "best_compression", "mapping": { "ignore_malformed": "true" } } }, "mappings": { "_source": { "enabled": true }, "date_detection": false, "dynamic": "strict", "dynamic_templates": [ { "all_strings_to_keywords": { "mapping": { "ignore_above": 1024, "type": "keyword" }, "match_mapping_type": "string" } }, { "complex_attributes": { "path_match": [ "resource.attributes.*", "scope.attributes.*", "attributes.*" ], "match_mapping_type": "object", "mapping": { "type": "flattened" } } } ], "properties": { "@timestamp": { "type": "date_nanos", "ignore_malformed": false }, "data_stream": { "type": "object", "properties": { "type": { "type": "constant_keyword" }, "dataset": { "type": "constant_keyword" }, "namespace": { "type": "constant_keyword" } } }, "observed_timestamp": { "type": "date_nanos", "ignore_malformed": true }, "severity_number": { "type": "long" }, "severity_text": { "type": "keyword" }, "body_text": { "type": "match_only_text" }, "body_structured": { "type": "flattened" }, "attributes": { "type": "passthrough", "dynamic": true, "priority": 2 }, "dropped_attributes_count": { "type": "long" }, "trace_flags": { "type": "byte" }, "trace_id": { "type": "keyword" }, "span_id": { "type": "keyword" }, "scope": { "properties": { "name": { "type": "keyword" }, "version": { "type": "keyword" }, "attributes": { "type": "passthrough", "dynamic": true, "priority": 1 }, "dropped_attributes_count": { "type": "long" }, "schema_url": { "type": "keyword" } } }, "resource": { "properties": { "dropped_attributes_count": { "type": "long" }, "schema_url": { "type": "keyword" }, "attributes": { "type": "passthrough", "dynamic": true, "priority": 0 } } } } } }, "index_patterns": [ "logs-*.otel-*" ], "data_stream": {} } ``` Here is an example of the auditd document in Elasticsearch abbreviated: ``` { "@timestamp": "2024-05-29T13:30:25.085926000Z", "attributes": { "foo": "bar", "some.bool": true }, "body_structured": { "MESSAGE": "AVC apparmor=\"STATUS\" operation=\"profile_replace\" info=\"same as current profile, skipping\" profile=\"unconfined\" name=\"/usr/bin/evince-previewer\" pid=2702 comm=\"apparmor_parser\"", "SYSLOG_FACILITY": "4", "SYSLOG_IDENTIFIER": "audit", "_SOURCE_REALTIME_TIMESTAMP": "1716989425080000", "_TRANSPORT": "audit", }, "dropped_attributes_count": 0, "observed_timestamp": "2024-05-29T14:49:26.534908898Z", "resource": { "attributes": { "data_stream.dataset": "auditd.otel", "data_stream.namespace": "default", "data_stream.type": "logs", "host.arch": "arm64", "host.cpu.cache.l2.size": 0, "host.cpu.family": "", "host.cpu.model.id": "0x000", "host.cpu.model.name": "", "host.cpu.stepping": "0", "host.cpu.vendor.id": "Apple", "host.id": "cae0e0147d454a80971b0b747c8b62b9", "host.ip": [ "172.16.3.131", "fe80::20c:29ff:fe66:3012", "host.name": "lebuntu", "host.os.description": "Ubuntu 22.04.4 LTS (Jammy Jellyfish) (Linux lebuntu 5.15.0-107-generic open-telemetry#117-Ubuntu SMP Mon Apr 29 14:37:09 UTC 2024 aarch64)", "host.os.type": "linux", "os.description": "Ubuntu 22.04.4 LTS (Jammy Jellyfish) (Linux lebuntu 5.15.0-107-generic open-telemetry#117-Ubuntu SMP Mon Apr 29 14:37:09 UTC 2024 aarch64)", "os.type": "linux" }, "dropped_attributes_count": 0, "schema_url": "https://opentelemetry.io/schemas/1.6.1" }, "severity_number": 0, "trace_flags": 0 } ``` Here is an example of ECS compatible query that works on this Otel native schema: ``` GET logs-auditd.otel-default/_search { "query": { "bool": { "must": [ { "match": { "host.name": "lebuntu" } } ] } } } ``` **Link to tracking Issue:** No tracking issue yet. **Testing:** Added unit test for OTel transformation. Tested with journald OTel receiver. **Documentation:** No documentation is added yet. --------- Co-authored-by: Felix Barnsteiner <[email protected]> Co-authored-by: Carson Ip <[email protected]>

aleksmaus added 2 commits May 29, 2024 09:56

Implement OTel mode serialization

3f2f30f

Enforce flattened attributes

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aleksmaus requested a review from a team as a code owner May 29, 2024 15:26

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aleksmaus and others added 4 commits May 30, 2024 10:43

Merge branch 'main' into feature/elasticsearch_otel_model

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Merge branch 'main' into feature/elasticsearch_otel_model

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Merge branch 'main' into feature/elasticsearch_otel_model

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Add support for data_stream.* routing

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Return the set of prefixes that need to stay flattened

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axw mentioned this pull request Jul 29, 2024

Map all OTel attributes elastic/apm-data#183

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[exporter/elasticsearch] OTel mode serialization #33290

[exporter/elasticsearch] OTel mode serialization #33290

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[exporter/elasticsearch] OTel mode serialization #33290

[exporter/elasticsearch] OTel mode serialization #33290

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aleksmaus commented May 29, 2024 •

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aleksmaus Jul 10, 2024 •

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