I suggest you take Prometheus entirely out of the picture, and scrape your
metrics endpoint directly using curl:
curl localhost:8881/metrics
See if your expected custom metric is there. If it's not, then that's why
Prometheus isn't showing it, and you need to debug your Python code.
On Wednesday 3 January 2024 at 20:44:12 UTC Honsen Clock wrote:
> Issue Description:
> I have a Python Flask app and I wanna add a new metric
> "by_path_counter_doc_quality" for an API, which I added by:
> ```Python
> # app.py
>
> by_path_counter = metrics.counter(
> 'by_path_counter_doc_quality', 'Request count by request paths',
> labels={'path': lambda: request.path, 'method': lambda: request.method}
> )
> ...
> @app.route("/document_quality/transformation", methods=["POST"])
> @by_path_counter
> def run_comp_metrics():
> # code
> ```
> But when I start prometheus server and monitor, I cannot find this metrics
> on the metrics list. The flask app itself is working and using metric
> "flask_http_request_total" can find the requests.
> [image: prometheus-flask-app.png]
> - Moreover, I notice that the metrics list on the "metrics explorer" tab
> shows out-of-dated metrics. See the attached image, "by_path_counter" and
> "in_progress" were the metrics I added in previous scrape_config job.
>
> [image: prometheus-metrics list.png]
>
> My prometheus.yml:
> ```yaml
> # my global config
> global:
> scrape_interval: 15s
> evaluation_interval: 15s
>
> alerting:
> alertmanagers:
> - static_configs:
> - targets:
> # - alertmanager:9093
>
> rule_files:
> # - "first_rules.yml"
> # - "second_rules.yml"
>
> scrape_configs:
> - job_name: "doc-quality"
> static_configs:
> - targets: ["localhost:8881"]
> ```
> Some context about the issue:
> In my prometheus.yaml, I created a job "flask_app", with metrics called
> "by_path_counter" and "in_progress". The metrics works well. So I wanna
> applied the same way to the current new job "doc-quality" and new metrics
> "by_path_counter_doc_quality".
>
> My questions:
> - What's the root cause for above issue? Why my new metric is now shown?
> - Are there any ways that I can reset/refresh the metrics? Maybe clean the
> time series DB? If so, how to to that.
>
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