Werk #16892: agent_kube: requests.SSLError raised on connection using self signed certificates

Component	Checks & agents
Title	agent_kube: requests.SSLError raised on connection using self signed certificates
Date	Sep 2, 2024
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.4.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.3.0p15 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0p33 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

Newer versions of requests don't take REQUESTS_CA_BUNDLE into account, resulting in

requests.exceptions.SSLError: \
    HTTPSConnectionPool(host='<collector>', port=443): \
        Max retries exceeded with url: \
            /metadata (Caused by SSLError( \
                SSLCertVerificationError(1, \
                    '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: \
                        self signed certificate in certificate chain (_ssl.c:1006)')))

being raised if running agent_kube against instances using self signed certificates.

This change invokes session.merge_environment_settings() to take REQUESTS_CA_BUNDLE into account again.

See GitHub: 2807: Use merge_environment_settings method in sessions.send method and GitHub: 3626: HTTP Proxy with prepared request (honouring env. var.)

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