debian-mirror-gitlab/doc/administration/troubleshooting/log_parsing.md

---
stage: Enablement
group: Distribution
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
---

# Parsing GitLab logs with `jq` **(FREE SELF)**

We recommend using log aggregation and search tools like Kibana and Splunk whenever possible,
but if they are not available you can still quickly parse
[GitLab logs](../logs.md) in JSON format
(the default in GitLab 12.0 and later) using [`jq`](https://stedolan.github.io/jq/).

## What is JQ?

As noted in its [manual](https://stedolan.github.io/jq/manual/), `jq` is a command-line JSON processor. The following examples
include use cases targeted for parsing GitLab log files.

## Parsing Logs

### General Commands

#### Pipe colorized `jq` output into `less`

```shell
jq . <FILE> -C | less -R
```

#### Search for a term and pretty-print all matching lines

```shell
grep <TERM> <FILE> | jq .
```

#### Skip invalid lines of JSON

```shell
jq -cR 'fromjson?' file.json | jq <COMMAND>
```

By default `jq` will error out when it encounters a line that is not valid JSON.
This skips over all invalid lines and parses the rest.

#### Print a JSON log's time range

```shell
cat log.json | (head -1; tail -1) | jq '.time'
```

Use `zcat` if the file has been rotated and compressed:

```shell
zcat @400000006026b71d1a7af804.s | (head -1; tail -1) | jq '.time'

zcat some_json.log.25.gz | (head -1; tail -1) | jq '.time'
```

#### Get activity for correlation ID across multiple JSON logs in chronological order

```shell
grep -hR <correlationID> | jq -c -R 'fromjson?' | jq -C -s 'sort_by(.time)'  | less -R
```

### Parsing `production_json.log` and `api_json.log`

#### Find all requests with a 5XX status code

```shell
jq 'select(.status >= 500)' <FILE>
```

#### Top 10 slowest requests

```shell
jq -s 'sort_by(-.duration) | limit(10; .[])' <FILE>
```

#### Find and pretty print all requests related to a project

```shell
grep <PROJECT_NAME> <FILE> | jq .
```

#### Find all requests with a total duration > 5 seconds

```shell
jq 'select(.duration > 5000)' <FILE>
```

#### Find all project requests with more than 5 rugged calls

```shell
grep <PROJECT_NAME> <FILE> | jq 'select(.rugged_calls > 5)'
```

#### Find all requests with a Gitaly duration > 10 seconds

```shell
jq 'select(.gitaly_duration > 10000)' <FILE>
```

#### Find all requests with a queue duration > 10 seconds

```shell
jq 'select(.queue_duration > 10000)' <FILE>
```

#### Top 10 requests by # of Gitaly calls

```shell
jq -s 'map(select(.gitaly_calls != null)) | sort_by(-.gitaly_calls) | limit(10; .[])' <FILE>
```

### Parsing `production_json.log`

#### Print the top three controller methods by request volume and their three longest durations

```shell
jq -s -r 'group_by(.controller+.action) | sort_by(-length) | limit(3; .[]) | sort_by(-.duration) | "CT: \(length)\tMETHOD: \(.[0].controller)#\(.[0].action)\tDURS: \(.[0].duration),  \(.[1].duration),  \(.[2].duration)"' production_json.log
```

**Example output**

```plaintext
CT: 2721   METHOD: SessionsController#new  DURS: 844.06,  713.81,  704.66
CT: 2435   METHOD: MetricsController#index DURS: 299.29,  284.01,  158.57
CT: 1328   METHOD: Projects::NotesController#index DURS: 403.99,  386.29,  384.39
```

### Parsing `api_json.log`

#### Print top three routes with request count and their three longest durations

```shell
jq -s -r 'group_by(.route) | sort_by(-length) | limit(3; .[]) | sort_by(-.duration) | "CT: \(length)\tROUTE: \(.[0].route)\tDURS: \(.[0].duration),  \(.[1].duration),  \(.[2].duration)"' api_json.log
```

**Example output**

```plaintext
CT: 2472 ROUTE: /api/:version/internal/allowed   DURS: 56402.65,  38411.43,  19500.41
CT: 297  ROUTE: /api/:version/projects/:id/repository/tags       DURS: 731.39,  685.57,  480.86
CT: 190  ROUTE: /api/:version/projects/:id/repository/commits    DURS: 1079.02,  979.68,  958.21
```

### Parsing `gitaly/current`

#### Find all Gitaly requests sent from web UI

```shell
jq 'select(."grpc.meta.client_name" == "gitlab-web")' current
```

#### Find all failed Gitaly requests

```shell
jq 'select(."grpc.code" != null and ."grpc.code" != "OK")' current
```

#### Find all requests that took longer than 30 seconds

```shell
jq 'select(."grpc.time_ms" > 30000)' current
```

#### Print top ten projects by request volume and their three longest durations

```shell
jq --raw-output --slurp '
  map(
    select(
      ."grpc.request.glProjectPath" != null
      and ."grpc.request.glProjectPath" != ""
      and ."grpc.time_ms" != null
    )
  )
  | group_by(."grpc.request.glProjectPath")
  | sort_by(-length)
  | limit(10; .[])
  | sort_by(-."grpc.time_ms")
  | [
      length,
      .[0]."grpc.time_ms",
      .[1]."grpc.time_ms",
      .[2]."grpc.time_ms",
      .[0]."grpc.request.glProjectPath"
    ]
  | @sh' /var/log/gitlab/gitaly/current \
| awk 'BEGIN { printf "%7s %10s %10s %10s\t%s\n", "CT", "MAX DURS", "", "", "PROJECT" }
  { printf "%7u %7u ms, %7u ms, %7u ms\t%s\n", $1, $2, $3, $4, $5 }'
```

**Example output**

```plaintext
   CT    MAX DURS                              PROJECT
  206    4898 ms,    1101 ms,    1032 ms      'groupD/project4'
  109    1420 ms,     962 ms,     875 ms      'groupEF/project56'
  663     106 ms,      96 ms,      94 ms      'groupABC/project123'
  ...
```

#### Find all projects affected by a fatal Git problem

```shell
grep "fatal: " /var/log/gitlab/gitaly/current | \
    jq '."grpc.request.glProjectPath"' | \
    sort | uniq
```

### Parsing `gitlab-shell.log`

For investigating Git calls via SSH, from [GitLab 12.10](https://gitlab.com/gitlab-org/gitlab-shell/-/merge_requests/367).

Find the top 20 calls by project and user:

```shell
jq --raw-output --slurp '
  map(
    select(
      .username != null and
      .gl_project_path !=null
    )
  )
  | group_by(.username+.gl_project_path)
  | sort_by(-length)
  | limit(20; .[])
  | "count: \(length)\tuser: \(.[0].username)\tproject: \(.[0].gl_project_path)" ' \
  /var/log/gitlab/gitlab-shell/gitlab-shell.log
```

Find the top 20 calls by project, user, and command:

```shell
jq --raw-output --slurp '
  map(
    select(
      .command  != null and
      .username != null and
      .gl_project_path !=null
    )
  )
  | group_by(.username+.gl_project_path+.command)
  | sort_by(-length)
  | limit(20; .[])
  | "count: \(length)\tcommand: \(.[0].command)\tuser: \(.[0].username)\tproject: \(.[0].gl_project_path)" ' \
  /var/log/gitlab/gitlab-shell/gitlab-shell.log
```