[Bug]: sprig function "env" is undefined

[ntx-ben]

Bug description

Running netdata v1.47.1 in Kubernetes v1.28.x

I'm using Service Discovery and trying to use the env sprig function in the go template to get the value of environment variables to populate credentials:

    - selector: rabbitmq
        template: |
          - module: rabbitmq
            name: rabbitmq-{{.TUID}}
            url: http://{{.Address}}
            username: {{(env "NETDATA_RABBITMQ_USERNAME")}}
            password: {{(env "NETDATA_RABBITMQ_PASSWORD")}}

However, the service is spitting out the following error message:

{"level":"warn","component":"pipeline manager","error":"build manager initialization: template: root:3: function \"env\" not defined","time":"2024-10-01 16:25:05","message":"unable to create a pipeline ('k8s/cmap/netdata/netdata-child-sd-config-map:config.yml')"}

Expected behavior

The Service Discovery service being able to process the sprig function env in the go template, per the official netdata documentation which states that sprig functions are supported (https://learn.netdata.cloud/docs/collecting-metrics/service-discovery#available-functions-1)

Steps to reproduce

Use the env sprig function in a go template of the Service Discovery configuration, as shown in the description

Installation method

helmchart (kubernetes)

System info

Linux k3s 6.6.44-0-virt #1-Alpine SMP PREEMPT_DYNAMIC 2024-08-05 06:49:58 x86_64 Linux
/etc/alpine-release:3.20.2
/etc/os-release:NAME="Alpine Linux"
/etc/os-release:ID=alpine
/etc/os-release:VERSION_ID=3.20.2
/etc/os-release:PRETTY_NAME="Alpine Linux v3.20"

Netdata build info

Packaging:
    Netdata Version ____________________________________________ : v1.47.1
    Installation Type __________________________________________ : oci
    Package Architecture _______________________________________ : x86_64
    Package Distro _____________________________________________ : unknown
    Configure Options __________________________________________ : dummy-configure-command
Default Directories:
    User Configurations ________________________________________ : /etc/netdata
    Stock Configurations _______________________________________ : /usr/lib/netdata/conf.d
    Ephemeral Databases (metrics data, metadata) _______________ : /var/cache/netdata
    Permanent Databases ________________________________________ : /var/lib/netdata
    Plugins ____________________________________________________ : /usr/libexec/netdata/plugins.d
    Static Web Files ___________________________________________ : /usr/share/netdata/web
    Log Files __________________________________________________ : /var/log/netdata
    Lock Files _________________________________________________ : /var/lib/netdata/lock
    Home _______________________________________________________ : /var/lib/netdata
Operating System:
    Kernel _____________________________________________________ : Linux
    Kernel Version _____________________________________________ : 6.6.44-0-virt
    Operating System ___________________________________________ : Alpine Linux
    Operating System ID ________________________________________ : alpine
    Operating System ID Like ___________________________________ : unknown
    Operating System Version ___________________________________ : unknown
    Operating System Version ID ________________________________ : 12
    Detection __________________________________________________ : /host/etc/os-release
Hardware:
    CPU Cores __________________________________________________ : 4
    CPU Frequency ______________________________________________ : 2200000000
    RAM Bytes __________________________________________________ : 33599172608
    Disk Capacity ______________________________________________ : 269435797504
    CPU Architecture ___________________________________________ : x86_64
    Virtualization Technology __________________________________ : kvm
    Virtualization Detection ___________________________________ : lscpu
Container:
    Container __________________________________________________ : container
    Container Detection ________________________________________ : kubernetes
    Container Orchestrator _____________________________________ : kubernetes
    Container Operating System _________________________________ : Debian GNU/Linux
    Container Operating System ID ______________________________ : debian
    Container Operating System ID Like _________________________ : unknown
    Container Operating System Version _________________________ : 12 (bookworm)
    Container Operating System Version ID ______________________ : 12
    Container Operating System Detection _______________________ : /etc/os-release
Features:
    Built For __________________________________________________ : Linux
    Netdata Cloud ______________________________________________ : YES
    Health (trigger alerts and send notifications) _____________ : YES
    Streaming (stream metrics to parent Netdata servers) _______ : YES
    Back-filling (of higher database tiers) ____________________ : YES
    Replication (fill the gaps of parent Netdata servers) ______ : YES
    Streaming and Replication Compression ______________________ : YES (zstd lz4 gzip)
    Contexts (index all active and archived metrics) ___________ : YES
    Tiering (multiple dbs with different metrics resolution) ___ : YES (5)
    Machine Learning ___________________________________________ : YES
Database Engines:
    dbengine (compression) _____________________________________ : YES (zstd lz4)
    alloc ______________________________________________________ : YES
    ram ________________________________________________________ : YES
    none _______________________________________________________ : YES
Connectivity Capabilities:
    ACLK (Agent-Cloud Link: MQTT over WebSockets over TLS) _____ : YES
    static (Netdata internal web server) _______________________ : YES
    h2o (web server) ___________________________________________ : YES
    WebRTC (experimental) ______________________________________ : NO
    Native HTTPS (TLS Support) _________________________________ : YES
    TLS Host Verification ______________________________________ : YES
Libraries:
    LZ4 (extremely fast lossless compression algorithm) ________ : YES
    ZSTD (fast, lossless compression algorithm) ________________ : YES
    zlib (lossless data-compression library) ___________________ : YES
    Brotli (generic-purpose lossless compression algorithm) ____ : NO
    protobuf (platform-neutral data serialization protocol) ____ : YES (system)
    OpenSSL (cryptography) _____________________________________ : YES
    libdatachannel (stand-alone WebRTC data channels) __________ : NO
    JSON-C (lightweight JSON manipulation) _____________________ : YES
    libcap (Linux capabilities system operations) ______________ : NO
    libcrypto (cryptographic functions) ________________________ : YES
    libyaml (library for parsing and emitting YAML) ____________ : YES
    libmnl (library for working with netfilter) ________________ : YES
Plugins:
    apps (monitor processes) ___________________________________ : YES
    cgroups (monitor containers and VMs) _______________________ : YES
    cgroup-network (associate interfaces to CGROUPS) ___________ : YES
    proc (monitor Linux systems) _______________________________ : YES
    tc (monitor Linux network QoS) _____________________________ : YES
    diskspace (monitor Linux mount points) _____________________ : YES
    freebsd (monitor FreeBSD systems) __________________________ : NO
    macos (monitor MacOS systems) ______________________________ : NO
    statsd (collect custom application metrics) ________________ : YES
    timex (check system clock synchronization) _________________ : YES
    idlejitter (check system latency and jitter) _______________ : YES
    bash (support shell data collection jobs - charts.d) _______ : YES
    debugfs (kernel debugging metrics) _________________________ : YES
    cups (monitor printers and print jobs) _____________________ : NO
    ebpf (monitor system calls) ________________________________ : NO
    freeipmi (monitor enterprise server H/W) ___________________ : YES
    nfacct (gather netfilter accounting) _______________________ : NO
    perf (collect kernel performance events) ___________________ : YES
    slabinfo (monitor kernel object caching) ___________________ : YES
    Xen ________________________________________________________ : NO
    Xen VBD Error Tracking _____________________________________ : NO
Exporters:
    AWS Kinesis ________________________________________________ : NO
    GCP PubSub _________________________________________________ : NO
    MongoDB ____________________________________________________ : YES
    Prometheus (OpenMetrics) Exporter __________________________ : YES
    Prometheus Remote Write ____________________________________ : YES
    Graphite ___________________________________________________ : YES
    Graphite HTTP / HTTPS ______________________________________ : YES
    JSON _______________________________________________________ : YES
    JSON HTTP / HTTPS __________________________________________ : YES
    OpenTSDB ___________________________________________________ : YES
    OpenTSDB HTTP / HTTPS ______________________________________ : YES
    All Metrics API ____________________________________________ : YES
    Shell (use metrics in shell scripts) _______________________ : YES
Debug/Developer Features:
    Trace All Netdata Allocations (with charts) ________________ : NO
    Developer Mode (more runtime checks, slower) _______________ : NO

Additional info

No response