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I can see the target status as down and Error "INVALID" is not a valid start token in prometheus console.
I followed the steps below:
Below are detailed information -
prometheus logs :
level=warn ts=2019-09-06T11:42:42.187Z caller=scrape.go:937 component="scrape manager" scrape_pool=weblogic1 target=http://**********.*.****.*:7001/wls-exporter msg="append failed" err="\"INVALID\" is not a valid start token"
curl output1 :-
-bash-4.2$ curl http://**********.***.****.***:7001/wls-exporter | promtool check metrics
-bash: promtool: command not found
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 1783 100 1783 0 0 323k 0 --:--:-- --:--:-- --:--:-- 348k
(23) Failed writing body
-bash-4.2$
curl output2 :-
-bash-4.2$ curl -v --noproxy '*' 'http://**********.***.****.***:7001/wls-exporter'
* About to connect() to **********.***.****.*** port 7001 (#0)
* Trying **.**.***.***...
* Connected to **********.***.****.*** (**.**.***.***) port 7001 (#0)
> GET /wls-exporter HTTP/1.1
> User-Agent: curl/7.29.0
> Host: **********.***.****.***:7001
> Accept: */*
>
< HTTP/1.1 200 OK
< Date: Fri, 06 Sep 2019 11:27:23 GMT
< Content-Length: 1783
<
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Weblogic Monitoring Exporter</title>
</head>
<body>
<h2>This is the WebLogic Monitoring Exporter.</h2>
<p>The metrics are found at <a href="/wls-exporter/metrics">
metrics</a> relative to this location.
</p>
<h2>Configuration</h2>
<p>To change the configuration:</p>
<form action="/wls-exporter/configure" method="post" enctype="multipart/form-data">
<input type="radio" name="effect" value="append">Append
<input type="radio" name="effect" value="replace" checked="checked">Replace
<br><input type="file" name="configuration">
<br><input type="submit">
</form>
<p>Current Configuration</p>
<p><code><pre>
host: **********.***.****.***
port: 7001
query_sync:
url: http://coordinator:8999/
refreshInterval: 5
metricsNameSnakeCase: true
domainQualifier: true
restPort: 7001
queries:
- key: name
keyName: server
applicationRuntimes:
key: name
keyName: app
componentRuntimes:
type: WebAppComponentRuntime
prefix: webapp_config_
key: name
values: [deploymentState, contextRoot, sourceInfo, openSessionsHighCount, openSessionsCurrentCount, sessionsOpenedTotalCount, sessionCookieMaxAgeSecs, sessionInvalidationIntervalSecs, sessionTimeoutSecs, singleThreadedServletPoolSize, sessionIDLength, servletReloadCheckSecs, jSPPageCheckSecs]
servlets:
prefix: weblogic_servlet_
key: servletName
values: [invocationTotalCount, reloadTotal, executionTimeAverage, poolMaxCapacity, executionTimeTotal, reloadTotalCount, executionTimeHigh, executionTimeLow]
- JVMRuntime:
prefix: jvm_
key: name
values: [heapFreeCurrent, heapFreePercent, heapSizeCurrent, heapSizeMax, uptime, processCpuLoad]
</pre></code></p>
* Connection #0 to host **********.***.****.*** left intact
-bash-4.2$
424
asked May 22 '26 05:05
The error ""INVALID" is not a valid start token" is usually encountered when Prometheus expects an OpenMetric format but get something else. In this occurrence, the exporter landing page if you omit the /metrics at the en of the URL or if the exporter reports an error page (401 - Authentication required.
Looking into the relevant source code, it seems the authentication token sent by Prometheus to the exporter are forwarded to the Weblogic API. The prometheus config should look like:
- job_name: 'weblogic'
...
basic_auth:
username: weblogic
password: friend
You can test it using curl with the relevant parameters:
curl -u 'weblogic:friend' http://**********.***.****.***:7001/wls-exporter/metrics | promtool check metrics
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