Summary

The logFrontendServiceLevelIndicators() mutation writes one or more frontend service level indicators to the humio repository, tagging each event with #kind=frontend. Each indicator is submitted as a ServiceLevelIndicatorLogArg object containing the frontend version string and a JSON payload describing the measured signal. The mutation returns true when all indicators are written successfully.

API Stability Short-Term

Syntax

graphql
logFrontendServiceLevelIndicators(
      input: [ServiceLevelIndicatorLogArg!]!
   ): Boolean!

The input argument accepts a non-null list of non-null ServiceLevelIndicatorLogArg objects. You must supply at least one object. Each object requires two fields: frontendVersion, a string identifying the client version, and content, a JSON scalar carrying the indicator payload. The mutation returns Boolean!; a value of true confirms that all indicators were written.

Example

Raw
graphql
mutation {
  logFrontendServiceLevelIndicators(input: 
    { frontendVersion: "1.0.3",
      content: "some-content",
    } )
}
Mac OS or Linux (curl)
shell
curl -v -X POST $YOUR_LOGSCALE_URL/graphql \
    -H "Authorization: Bearer $TOKEN" \
    -H "Content-Type: application/json" \
    -d @- << EOF
{"query" : "mutation {
  logFrontendServiceLevelIndicators(input: 
    { frontendVersion: \"1.0.3\",
      content: \"some-content\",
    } )
}"
}
EOF
Mac OS or Linux (curl) One-line
shell
curl -v -X POST $YOUR_LOGSCALE_URL/graphql \
    -H "Authorization: Bearer $TOKEN" \
    -H "Content-Type: application/json" \
    -d @- << EOF
{"query" : "mutation {
  logFrontendServiceLevelIndicators(input: 
    { frontendVersion: \"1.0.3\",
      content: \"some-content\",
    } )
}"
}
EOF
Windows Cmd and curl
shell
curl -v -X POST $YOUR_LOGSCALE_URL/graphql ^
    -H "Authorization: Bearer $TOKEN" ^
    -H "Content-Type: application/json" ^
    -d @'{"query" : "mutation { ^
  logFrontendServiceLevelIndicators(input:  ^
    { frontendVersion: \"1.0.3\", ^
      content: \"some-content\", ^
    } ) ^
}" ^
} '
Windows Powershell and curl
powershell
curl.exe -X POST 
    -H "Authorization: Bearer $TOKEN"
    -H "Content-Type: application/json"
    -d '{"query" : "mutation {
  logFrontendServiceLevelIndicators(input: 
    { frontendVersion: \"1.0.3\",
      content: \"some-content\",
    } )
}"
}'
    "$YOUR_LOGSCALE_URL/graphql"
Perl
perl
#!/usr/bin/perl

use HTTP::Request;
use LWP;

my $TOKEN = "TOKEN";

my $uri = '$YOUR_LOGSCALE_URL/graphql';

my $query = "mutation {
  logFrontendServiceLevelIndicators(input: 
    { frontendVersion: \"1.0.3\",
      content: \"some-content\",
    } )
}";
$query =~ s/\n/ /g;
my $json = sprintf('{"query" : "%s"}',$query);
my $req = HTTP::Request->new("POST", $uri );

$req->header("Authorization" => "Bearer $TOKEN");
$req->header("Content-Type" => "application/json");

$req->content( $json );

my $lwp = LWP::UserAgent->new;

my $result = $lwp->request( $req );

print $result->{"_content"},"\n";
Python
python
#! /usr/local/bin/python3

import requests

url = '$YOUR_LOGSCALE_URL/graphql'
mydata = r'''{"query" : "mutation {
  logFrontendServiceLevelIndicators(input: 
    { frontendVersion: \"1.0.3\",
      content: \"some-content\",
    } )
}"
}'''

resp = requests.post(url,
                     data = mydata,
                     headers = {
   "Authorization" : "Bearer $TOKEN",
   "Content-Type" : "application/json"
}
)

print(resp.text)
Node.js
javascript
const https = require('https');

const data = JSON.stringify(
    {"query" : "mutation {
  logFrontendServiceLevelIndicators(input: 
    { frontendVersion: \"1.0.3\",
      content: \"some-content\",
    } )
}"
}
);


const options = {
  hostname: '$YOUR_LOGSCALE_URL',
  path: 'graphql',
  port: 443,
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Content-Length': data.length,
    Authorization: 'BEARER ' + process.env.TOKEN,
    'User-Agent': 'Node',
  },
};

const req = https.request(options, (res) => {
  let data = '';
  console.log(`statusCode: ${res.statusCode}`);

  res.on('data', (d) => {
    data += d;
  });
  res.on('end', () => {
    console.log(JSON.parse(data).data);
  });
});

req.on('error', (error) => {
  console.error(error);
});

req.write(data);
req.end();

Input Parameters

The input argument takes a list of ServiceLevelIndicatorLogArg objects. Each object requires frontendVersion to identify the client build and content to supply the indicator data as a JSON scalar. The following table describes all fields of this input type:

Table: ServiceLevelIndicatorLogArg Input Datatype

ParameterTypeRequiredDefaultStabilityAvailabilityDescription
Some input parameters may be required, as indicated in the Required column. For return values, this indicates that you are assured a value if the field is requested for the results. 
Table last updated: Oct 14, 2026 
contentJSONyes Preview The content of the service level indicator. JSON is a scalar.
frontendVersionStringyes Preview The front-end version.