Parsing GitLab logs with jq

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 in JSON format (the default in GitLab 12.0 and later) using jq.

note
Specifically for summarizing error events and basic usage statistics, the GitLab Support Team provides the specialised fast-stats tool.

What is JQ?

As noted in its manual, jq is a command-line JSON processor. The following examples include use cases targeted for parsing GitLab log files.

Parsing Logs

The examples listed below address their respective log files by their relative Omnibus paths and default filenames. Find the respective full paths in the GitLab logs sections.

General Commands

Pipe colorized jq output into less

jq . <FILE> -C | less -R

Search for a term and pretty-print all matching lines

grep <TERM> <FILE> | jq .

Skip invalid lines of JSON

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.

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

Use zcat if the file has been rotated and compressed:

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

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

Parsing gitlab-rails/production_json.log and gitlab-rails/api_json.log

Find all requests with a 5XX status code

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

Top 10 slowest requests

jq -s 'sort_by(-.duration_s) | limit(10; .[])' <FILE>
grep <PROJECT_NAME> <FILE> | jq .

Find all requests with a total duration > 5 seconds

jq 'select(.duration_s > 5000)' <FILE>

Find all project requests with more than 5 rugged calls

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

Find all requests with a Gitaly duration > 10 seconds

jq 'select(.gitaly_duration_s > 10000)' <FILE>

Find all requests with a queue duration > 10 seconds

jq 'select(.queue_duration_s > 10000)' <FILE>

Top 10 requests by # of Gitaly calls

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

Parsing gitlab-rails/production_json.log

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

Example output

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 gitlab-rails/api_json.log

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

Example output

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 gitlab-rails/geo.log

Find most common Geo sync errors

If the geo:status Rake task repeatedly reports that some items never reach 100%, the following command helps to focus on the most common errors.

jq --raw-output 'select(.severity == "ERROR") | [.project_path, .message] | @tsv' geo.log | sort | uniq -c | sort | tail

Parsing gitaly/current

The following examples are useful to troubleshoot Gitaly.

Find all Gitaly requests sent from web UI

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

Find all failed Gitaly requests

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

Find all requests that took longer than 30 seconds

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

   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

grep "fatal: " current | \
    jq '."grpc.request.glProjectPath"' | \
    sort | uniq

Parsing gitlab-shell/gitlab-shell.log

For investigating Git calls via SSH, from GitLab 12.10.

Find the top 20 calls by project and user:

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)" ' \
  gitlab-shell.log

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

jq --raw-output --slurp '
  map(
    select(
      .command  != null and
      .username != null and
      .gl_project_path !=null
    )
  )
  | group_by(.username+.gl_project_path+.