GitHub user santurini created a discussion: Failing DAGs out of nowhere

### Apache Airflow version

Other Airflow 2/3 version (please specify below)

### If "Other Airflow 2/3 version" selected, which one?

3.0.2

### What happened?

All my dags are failing out of nowhere with this log:
Log message source details: sources=["Could not read served logs: Invalid URL 
'http://:8793/log/dag_id=debug_variable_access/run_id=manual__2025-12-09T16:09:40.619210+00:00/task_id=read_and_log_variables/attempt=1.log':
 No host supplied"]

### What you think should happen instead?

The dag should run succesfully

### How to reproduce

Example DAG:
```
from __future__ import annotations
from datetime import datetime
from airflow.decorators import dag, task
from airflow.models import Variable

@dag(
    dag_id="debug_variable_access",
    start_date=datetime(2024, 1, 1),
    schedule=None,
    catchup=False,
    tags=["debug"],
)
def debug_variable_dag():
    @task
    def read_and_log_variables():
        """Reads the specific variables and logs them."""
        import logging

        try:
            # Using the default_var parameter will prevent the task from failing
            # and will help us debug the value.
            token = Variable.get("GIT_TOKEN", default_var="[GIT_TOKEN NOT 
FOUND]")
            version = Variable.get("COMPANY_DATA_MODEL_PKG_VERSION", 
default_var="[VERSION NOT FOUND]")

            logging.info(f"GIT_TOKEN found: '{token}'")
            logging.info(f"COMPANY_DATA_MODEL_PKG_VERSION found: '{version}'")

        except Exception as e:
            logging.error(f"An unexpected error occurred: {e}")

    read_and_log_variables()

debug_variable_dag()
```

### Operating System

PRETTY_NAME="Ubuntu 24.04.2 LTS" NAME="Ubuntu" VERSION_ID="24.04" 
VERSION="24.04.2 LTS (Noble Numbat)" VERSION_CODENAME=noble ID=ubuntu 
ID_LIKE=debian HOME_URL="https://www.ubuntu.com/"; 
SUPPORT_URL="https://help.ubuntu.com/"; 
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"; 
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy";
 UBUNTU_CODENAME=noble LOGO=ubuntu-logo

### Versions of Apache Airflow Providers

_No response_

### Deployment

Official Apache Airflow Helm Chart

### Deployment details

Kubernetes deployment values:
```
images:
  airflow:
    repository: ${IMAGE_NAME}
    tag: ${VERSION}
    pullPolicy: Always

ingress:
  apiServer:
    enabled: true
    annotations:
      projectcontour.io/response-timeout: "120s"
    hosts: 
      - name: "airflow.staging.translated.cloud"
    ingressClassName: "contour"

env:
  - name: "AIRFLOW__API__AUTH_BACKEND"
    value: "airflow.api.auth.backend.basic_auth"
  - name: "AIRFLOW__CORE__DAGS_ARE_PAUSED_AT_CREATION"
    value: "True"
  - name: "AIRFLOW__CORE__LOAD_EXAMPLES"
    value: "False"
  - name: AIRFLOW__CORE__EXECUTE_TASKS_NEW_PYTHON_INTERPRETER
    value: "True"
  - name: AIRFLOW__LOGGING__REMOTE_LOGGING
    value: "True"
  - name: AIRFLOW__LOGGING__REMOTE_LOG_CONN_ID
    value: "LoggingS3Connection"
  - name: AIRFLOW__LOGGING__REMOTE_BASE_LOG_FOLDER
    value: "s3://logs-archive-product-team/Airflow"
  - name: AIRFLOW__LOGGING__ENCRYPT_S3_LOGS
    value: "False"
  - name: AIRFLOW__CORE__ENABLE_XCOM_PICKLING
    value: "True"
  - name: AIRFLOW__SMTP__SMTP_HOST
    value: "smtp.gmail.com"
  - name: AIRFLOW__SMTP__SMTP_PORT
    value: "587"
  - name: AIRFLOW__SMTP__SMTP_SSL
    value: "False"
  - name: AIRFLOW__SMTP__SMTP_STARTTLS
    value: "True"
  - name: AIRFLOW__SMTP__SMTP_USER
    value: "[email protected]"
  - name: "CM_API_URL"
    value: "https://cm-api.translated.cloud/api";

secret:
  - envName: "GIT_TOKEN"
    secretName: "airflow-git-token"
    secretKey: "GIT_TOKEN"

data:
  metadataSecretName: "airflow-pgbouncer-connection"

fernetKey: ${FERNET_KEY}
webserverSecretKey: ${WEBSERVER_SECRET_KEY}

workers:
  replicas: 1

registry:
  secretName: regcred
  
postgresql:
  enabled: false

pgbouncer:
  enabled: true
  configSecretName: airflow-pgbouncer-config
  metricsExporterSidecar:
    statsSecretName: airflow-pgbouncer-stats

dags:
  gitSync:
    enabled: true
    repo: [email protected]:translated/airflow-dags.git
    branch: develop
    ref: develop
    depth: 1
    subPath: "dags"
    sshKeySecret: airflow-ssh-secret
```

### Anything else?

For every dag that previously was working now I have this error

### Are you willing to submit PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [x] I agree to follow this project's [Code of 
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)


GitHub link: https://github.com/apache/airflow/discussions/59253

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