Invalid token error while scraping a target

[Tasleem Halai]

I am using Prometheus : 2.8.1

prometheus config:

scrape_configs:

  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.

  - job_name: 'prometheus'

    # metrics_path defaults to '/metrics'

    # scheme defaults to 'http'.

    static_configs:

    - targets: ['localhost:9090']

  - job_name: 'grafana'

    static_configs:

    - targets: ['localhost:3000']

  - job_name: 'TestApp'

    metrics_path: '/actuator/prometheus'

    static_configs:

    - targets: ['localhost:8080']

http://localhost:8080/actuator/prometheus gives following metrics like:

# HELP jvm_buffer_memory_used_bytes An estimate of the memory that the Java virtual machine is using for this buffer pool
# TYPE jvm_buffer_memory_used_bytes gauge
jvm_buffer_memory_used_bytes{id="mapped",} 0.0
jvm_buffer_memory_used_bytes{id="direct",} 81920.0
# HELP hikaricp_connections Total connections
# TYPE hikaricp_connections gauge
hikaricp_connections{pool="HikariPool-1",} 10.0
# HELP cache_size The number of entries in this cache. This may be an approximation, depending on the type of cache.
# TYPE cache_size gauge
cache_size{cache="addressTypesCache",cacheManager="cachceManager",name="addressTypesCache",} 0.0
cache_size{cache="feeTypesCache",cacheManager="cachceManager",name="feeTypesCache",} 0.0

But when prometheus tries to scrape it, it gives below error:

"INVALID" is not a valid start token

Its not clear from the logs or from this error as to whats wrong and how to fix it.

The spring boot app has security enabled & is protected by username and password.

I tried prometheus with few other versions and specifying basic auth in config but that dint work either.

Can someone please help me understand what could be missing here?

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Thanks,

Tasleem

[Murali Krishna Kanagala]

Metric format is not as as exp6by Prometheus. Promtool can validate the metric format.

Follow the steps in this link

https://www.robustperception.io/invalid-is-not-a-valid-start-token-and-other-scrape-errors

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