Golang

This Elastic integration collects metrics from Golang applications.


Version	1.4.1 (View all)
Compatible Kibana version(s)	8.12.0 or higher
Supported Serverless project types What's this?	Security Observability
Subscription level What's this?	Basic
Level of support What's this?	Elastic

Overview

The Golang integration allows you to monitor a Golang application. Go is a statically typed, compiled programming language designed at Google. It is syntactically similar to C, but with memory safety, garbage collection, structural typing, and CSP-style concurrency. It is often referred to as Golang.

Use the Golang integration to:

Gain insights into expvar and heap statistics.
Create visualizations to monitor, measure and analyze the state of heap, garbage collector, memory, mcache structures, mspan structures etc.

Data streams

The Golang integration collects metrics using expvar package. Metrics are exported on "/debug/vars" endpoint after importing expvar package and adding an HTTP handler.

Metrics help you keep a record of the state of the Go (Golang) application. Metric data streams collected by the Golang integration include expvar and heap.

Data streams:

heap: Collects heap metrics like heap allocation and garbage collection metrics.
expvar: Collects metrics like memstats, cmdline and custom (user-defined) metrics.

Note:

Users can monitor and see the metrics inside the ingested documents for Golang in the logs-* index pattern from Discover.

Compatibility

This integration has been tested against Golang versions 1.19 and 1.18.

Prerequisites

You need Elasticsearch for storing and searching your data and Kibana for visualizing and managing it. You can use our hosted Elasticsearch Service on Elastic Cloud, which is recommended or self-manage the Elastic Stack on your own hardware.

Setup

For step-by-step instructions on how to set up an integration, see the Getting started guide.

Troubleshooting

If host.ip appears conflicted under the logs-* data view, this issue can be resolved by reindexing the Heap and Expvar data streams.

Metrics reference

expvar

This is the expvar data stream. Metrics of garbage collector, mcache structures and mspan structures can be collected using expvar data stream. Custom metrics can also be collected under golang.expvar.custom field.

An example event for expvar looks as following:

{
    "@timestamp": "2023-01-04T13:03:30.958Z",
    "agent": {
        "ephemeral_id": "9e142190-e278-4791-852f-829b4d724ed9",
        "id": "688e9cab-ccca-4032-8384-7ad5f358a434",
        "name": "docker-fleet-agent",
        "type": "filebeat",
        "version": "8.5.1"
    },
    "data_stream": {
        "dataset": "golang.expvar",
        "namespace": "ep",
        "type": "logs"
    },
    "ecs": {
        "version": "8.5.1"
    },
    "elastic_agent": {
        "id": "688e9cab-ccca-4032-8384-7ad5f358a434",
        "snapshot": false,
        "version": "8.5.1"
    },
    "event": {
        "agent_id_status": "verified",
        "created": "2023-01-04T13:03:30.958Z",
        "dataset": "golang.expvar",
        "ingested": "2023-01-04T13:03:32Z",
        "kind": "metric",
        "module": "golang",
        "original": "{\"cmdline\":[\"./test\"],\"memstats\":{\"Alloc\":278472,\"BuckHashSys\":3906,\"BySize\":[{\"Frees\":0,\"Mallocs\":0,\"Size\":0},{\"Frees\":53,\"Mallocs\":82,\"Size\":8},{\"Frees\":334,\"Mallocs\":735,\"Size\":16},{\"Frees\":71,\"Mallocs\":93,\"Size\":24},{\"Frees\":46,\"Mallocs\":80,\"Size\":32},{\"Frees\":196,\"Mallocs\":306,\"Size\":48},{\"Frees\":162,\"Mallocs\":190,\"Size\":64},{\"Frees\":18,\"Mallocs\":33,\"Size\":80},{\"Frees\":30,\"Mallocs\":48,\"Size\":96},{\"Frees\":17,\"Mallocs\":21,\"Size\":112},{\"Frees\":61,\"Mallocs\":68,\"Size\":128},{\"Frees\":36,\"Mallocs\":38,\"Size\":144},{\"Frees\":18,\"Mallocs\":36,\"Size\":160},{\"Frees\":0,\"Mallocs\":6,\"Size\":176},{\"Frees\":0,\"Mallocs\":0,\"Size\":192},{\"Frees\":25,\"Mallocs\":47,\"Size\":208},{\"Frees\":16,\"Mallocs\":18,\"Size\":224},{\"Frees\":0,\"Mallocs\":1,\"Size\":240},{\"Frees\":47,\"Mallocs\":62,\"Size\":256},{\"Frees\":3,\"Mallocs\":6,\"Size\":288},{\"Frees\":2,\"Mallocs\":3,\"Size\":320},{\"Frees\":53,\"Mallocs\":60,\"Size\":352},{\"Frees\":0,\"Mallocs\":1,\"Size\":384},{\"Frees\":1,\"Mallocs\":56,\"Size\":416},{\"Frees\":0,\"Mallocs\":0,\"Size\":448},{\"Frees\":0,\"Mallocs\":0,\"Size\":480},{\"Frees\":15,\"Mallocs\":15,\"Size\":512},{\"Frees\":2,\"Mallocs\":4,\"Size\":576},{\"Frees\":1,\"Mallocs\":4,\"Size\":640},{\"Frees\":1,\"Mallocs\":3,\"Size\":704},{\"Frees\":0,\"Mallocs\":0,\"Size\":768},{\"Frees\":1,\"Mallocs\":1,\"Size\":896},{\"Frees\":15,\"Mallocs\":26,\"Size\":1024},{\"Frees\":2,\"Mallocs\":4,\"Size\":1152},{\"Frees\":1,\"Mallocs\":3,\"Size\":1280},{\"Frees\":1,\"Mallocs\":1,\"Size\":1408},{\"Frees\":108,\"Mallocs\":121,\"Size\":1536},{\"Frees\":0,\"Mallocs\":4,\"Size\":1792},{\"Frees\":29,\"Mallocs\":31,\"Size\":2048},{\"Frees\":1,\"Mallocs\":3,\"Size\":2304},{\"Frees\":1,\"Mallocs\":2,\"Size\":2688},{\"Frees\":0,\"Mallocs\":0,\"Size\":3072},{\"Frees\":0,\"Mallocs\":0,\"Size\":3200},{\"Frees\":0,\"Mallocs\":0,\"Size\":3456},{\"Frees\":68,\"Mallocs\":70,\"Size\":4096},{\"Frees\":13,\"Mallocs\":15,\"Size\":4864},{\"Frees\":0,\"Mallocs\":1,\"Size\":5376},{\"Frees\":16,\"Mallocs\":17,\"Size\":6144},{\"Frees\":0,\"Mallocs\":0,\"Size\":6528},{\"Frees\":0,\"Mallocs\":0,\"Size\":6784},{\"Frees\":0,\"Mallocs\":0,\"Size\":6912},{\"Frees\":4,\"Mallocs\":6,\"Size\":8192},{\"Frees\":0,\"Mallocs\":12,\"Size\":9472},{\"Frees\":0,\"Mallocs\":0,\"Size\":9728},{\"Frees\":0,\"Mallocs\":0,\"Size\":10240},{\"Frees\":0,\"Mallocs\":0,\"Size\":10880},{\"Frees\":0,\"Mallocs\":0,\"Size\":12288},{\"Frees\":0,\"Mallocs\":0,\"Size\":13568},{\"Frees\":0,\"Mallocs\":0,\"Size\":14336},{\"Frees\":0,\"Mallocs\":0,\"Size\":16384},{\"Frees\":0,\"Mallocs\":0,\"Size\":18432}],\"DebugGC\":false,\"EnableGC\":true,\"Frees\":1598,\"GCCPUFraction\":0.00010453488922881322,\"GCSys\":8585248,\"HeapAlloc\":278472,\"HeapIdle\":2736128,\"HeapInuse\":901120,\"HeapObjects\":865,\"HeapReleased\":2564096,\"HeapSys\":3637248,\"LastGC\":1672837410834975000,\"Lookups\":0,\"MCacheInuse\":14400,\"MCacheSys\":15600,\"MSpanInuse\":63104,\"MSpanSys\":65280,\"Mallocs\":2463,\"NextGC\":4194304,\"NumForcedGC\":19,\"NumGC\":19,\"OtherSys\":1077438,\"PauseEnd\":[1672837392815676400,1672837393816946700,1672837394817801500,1672837395818876400,1672837396820657200,1672837397822115300,1672837398823296500,1672837399824033800,1672837400825333800,1672837401826484500,1672837402827608800,1672837403828212000,1672837404829356800,1672837405830248000,1672837406830978000,1672837407831748000,1672837408832323300,1672837409833831000,1672837410834975000,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],\"PauseNs\":[61953,38812,89413,42429,90277,68619,117474,43316,43068,61573,45315,45976,45183,60469,199702,49007,45615,43247,42710,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],\"PauseTotalNs\":1234158,\"StackInuse\":557056,\"StackSys\":557056,\"Sys\":13941776,\"TotalAlloc\":1170744}}",
        "type": [
            "info"
        ]
    },
    "golang": {
        "expvar": {
            "buck_hash_sys": {
                "bytes": 3906
            },
            "cmdline": [
                "./test"
            ],
            "gc": {
                "forced": 19,
                "last_finished": {
                    "ns": 1672837410834975000
                },
                "metadata": {
                    "memory": {
                        "bytes": 8585248
                    }
                }
            },
            "mcache": {
                "allocated": {
                    "bytes": 14400
                },
                "obtained": {
                    "bytes": 15600
                }
            },
            "mspan": {
                "allocated": {
                    "bytes": 63104
                },
                "obtained": {
                    "bytes": 65280
                }
            },
            "obtained": {
                "miscellaneous": {
                    "bytes": 1077438
                },
                "total": {
                    "bytes": 13941776
                }
            },
            "pointer": {
                "lookups": 0
            },
            "stack": {
                "bytes": 557056
            }
        }
    },
    "input": {
        "type": "httpjson"
    },
    "service": {
        "address": "http://elastic-package-service_golang_1:6060"
    },
    "tags": [
        "preserve_original_event",
        "forwarded",
        "golang-expvar"
    ]
}

Exported fields

Field	Description	Type	Unit	Metric Type
@timestamp	Event timestamp.	date
data_stream.dataset	Data stream dataset.	constant_keyword
data_stream.namespace	Data stream namespace.	constant_keyword
data_stream.type	Data stream type.	constant_keyword
ecs.version	ECS version this event conforms to. `ecs.version` is a required field and must exist in all events. When querying across multiple indices -- which may conform to slightly different ECS versions -- this field lets integrations adjust to the schema version of the events.	keyword
error.message	Error message.	match_only_text
event.agent_id_status	Agents are normally responsible for populating the `agent.id` field value. If the system receiving events is capable of validating the value based on authentication information for the client then this field can be used to reflect the outcome of that validation. For example if the agent's connection is authenticated with mTLS and the client cert contains the ID of the agent to which the cert was issued then the `agent.id` value in events can be checked against the certificate. If the values match then `event.agent_id_status: verified` is added to the event, otherwise one of the other allowed values should be used. If no validation is performed then the field should be omitted. The allowed values are: `verified` - The `agent.id` field value matches expected value obtained from auth metadata. `mismatch` - The `agent.id` field value does not match the expected value obtained from auth metadata. `missing` - There was no `agent.id` field in the event to validate. `auth_metadata_missing` - There was no auth metadata or it was missing information about the agent ID.	keyword
event.created	event.created contains the date/time when the event was first read by an agent, or by your pipeline. This field is distinct from @timestamp in that @timestamp typically contain the time extracted from the original event. In most situations, these two timestamps will be slightly different. The difference can be used to calculate the delay between your source generating an event, and the time when your agent first processed it. This can be used to monitor your agent's or pipeline's ability to keep up with your event source. In case the two timestamps are identical, @timestamp should be used.	date
event.dataset	Name of the dataset. If an event source publishes more than one type of log or events (e.g. access log, error log), the dataset is used to specify which one the event comes from. It's recommended but not required to start the dataset name with the module name, followed by a dot, then the dataset name.	keyword
event.ingested	Timestamp when an event arrived in the central data store. This is different from `@timestamp`, which is when the event originally occurred. It's also different from `event.created`, which is meant to capture the first time an agent saw the event. In normal conditions, assuming no tampering, the timestamps should chronologically look like this: `@timestamp` < `event.created` < `event.ingested`.	date
event.kind	This is one of four ECS Categorization Fields, and indicates the highest level in the ECS category hierarchy. `event.kind` gives high-level information about what type of information the event contains, without being specific to the contents of the event. For example, values of this field distinguish alert events from metric events. The value of this field can be used to inform how these kinds of events should be handled. They may warrant different retention, different access control, it may also help understand whether the data coming in at a regular interval or not.	keyword
event.module	Name of the module this data is coming from. If your monitoring agent supports the concept of modules or plugins to process events of a given source (e.g. Apache logs), `event.module` should contain the name of this module.	keyword
event.original	Raw text message of entire event. Used to demonstrate log integrity or where the full log message (before splitting it up in multiple parts) may be required, e.g. for reindex. This field is not indexed and doc_values are disabled. It cannot be searched, but it can be retrieved from `_source`. If users wish to override this and index this field, please see `Field data types` in the `Elasticsearch Reference`.	keyword
event.type	This is one of four ECS Categorization Fields, and indicates the third level in the ECS category hierarchy. `event.type` represents a categorization "sub-bucket" that, when used along with the `event.category` field values, enables filtering events down to a level appropriate for single visualization. This field is an array. This will allow proper categorization of some events that fall in multiple event types.	keyword
golang.expvar.buck_hash_sys.bytes	Bytes of memory in profiling bucket hash tables.	long	byte	gauge
golang.expvar.cmdline	The cmdline of this Go program start with.	keyword
golang.expvar.gc.forced	The number of GC cycles that were forced by the application calling the GC function.	long		counter
golang.expvar.gc.last_finished.ns	The time the last garbage collection finished.	long	nanos	counter
golang.expvar.gc.metadata.memory.bytes	Bytes of memory in garbage collection metadata.	long	byte	gauge
golang.expvar.mcache.allocated.bytes	Bytes of allocated mcache structures.	long	byte	gauge
golang.expvar.mcache.obtained.bytes	Bytes of memory obtained from the OS for mcache structures.	long	byte	gauge
golang.expvar.mspan.allocated.bytes	Bytes of allocated mspan structures.	long	byte	gauge
golang.expvar.mspan.obtained.bytes	Bytes of memory obtained from the OS for mspan structures.	long	byte	gauge
golang.expvar.obtained.miscellaneous.bytes	Bytes of memory in miscellaneous off-heap runtime allocations.	long	byte	gauge
golang.expvar.obtained.total.bytes	The total bytes of memory obtained from the OS.	long	byte	gauge
golang.expvar.pointer.lookups	The number of pointer lookups performed by the runtime.	long		gauge
golang.expvar.stack.bytes	Bytes in stack spans.	long	byte	gauge
host.ip	Host ip addresses.	ip
input.type	Type of Filebeat input.	keyword
service.address	Address where data about this service was collected from. This should be a URI, network address (ipv4:port or [ipv6]:port) or a resource path (sockets).	keyword
tags	List of keywords used to tag each event.	keyword

Heap

This is the heap data stream. Metrics like heap allocations and GC pause can be collected using heap data stream.

An example event for heap looks as following:

{
    "@timestamp": "2023-02-01T10:17:48.723Z",
    "agent": {
        "ephemeral_id": "e385e1a9-0d82-4af1-8367-a39f246790b8",
        "id": "ba35afb2-0df7-4d14-8dc2-7a89e4bcbe18",
        "name": "docker-fleet-agent",
        "type": "filebeat",
        "version": "8.5.1"
    },
    "data_stream": {
        "dataset": "golang.heap",
        "namespace": "ep",
        "type": "logs"
    },
    "ecs": {
        "version": "8.5.1"
    },
    "elastic_agent": {
        "id": "ba35afb2-0df7-4d14-8dc2-7a89e4bcbe18",
        "snapshot": false,
        "version": "8.5.1"
    },
    "event": {
        "agent_id_status": "verified",
        "created": "2023-02-01T10:17:48.723Z",
        "dataset": "golang.heap",
        "ingested": "2023-02-01T10:17:49Z",
        "kind": "metric",
        "module": "golang",
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