graphite Tags DB disappears - maybe related to issues with rabbitmq ?

[turbopape]

Hey Guys,
I already posted this in the graphite repo.

I am operating a Kubernetes setup.

Graphite is sitting behind carbon-relay-ng. I am using it's stock whisper storage engine.
My specific config is as follows:

[carbon]
    pattern = ^carbon\.
    retentions = 10s:6h,1m:90d

    [default]
    pattern = .*
    retentions = 2m:6h,10m:7d,30m:30d,60m:360d

    [default]
    pattern : .*
    xFilesFactor = 0.0
    aggregationMethod = avg

Carbon-relay-ng is sipping tags-enabled messages from a rabbitmq queue.
Here is the config:

## Global settings ##
    # instance id's distinguish stats of multiple relays.
    # do not run multiple relays with the same instance id.
    # supported variables:
    #  ${HOST} : hostname
    instance = "${HOST}"

    ## System ##
    # this setting can be used to override the default GOMAXPROCS logic
    # it is ignored if the GOMAXPROCS environment variable is set
    max_procs = 2
    pid_file = "carbon-relay-ng.pid"
    # directory for spool files
    spool_dir = "spool"

    ## Logging ##
    # one of trace debug info warn error fatal panic
    # see docs/logging.md for level descriptions
    # note: if you used to use "notice", you should now use "info".
    log_level = "info"

    ## Admin ##
    admin_addr = "0.0.0.0:2004"
    http_addr = "0.0.0.0:8081"

    ## Inputs ##
    ### plaintext Carbon ###
    listen_addr = "0.0.0.0:2003"
    # close inbound plaintext connections if they've been idle for this long ("0s" to disable)
    plain_read_timeout = "0s"
    ### Pickle Carbon ###
    pickle_addr = "0.0.0.0:2013"
    # close inbound pickle connections if they've been idle for this long ("0s" to disable)
    pickle_read_timeout = "0s"

    ## Validation of inputs ##
    # you can also validate that each series has increasing timestamps
    validate_order = false

    # How long to keep track of invalid metrics seen
    # Useful time units are "s", "m", "h"
    bad_metrics_max_age = "24h"

    [[route]]
    key = 'carbon-default'
    type = 'sendAllMatch'
    # prefix = ''
    # notPrefix = ''
    # sub = ''
    # notSub = ''
    # regex = '.*'
    # notRegex = ''
    destinations = [
      'graphite-statsd.graphite.svc.cluster.local:2003 spool=true pickle=false'
    ]

    ### AMQP ###
    [amqp]
    amqp_enabled = true
    amqp_host = "aRabbitHost"
    amqp_port = 5672
    amqp_user = "SomeUser"
    amqp_password = "SomePassword"
    amqp_vhost = "/"
    amqp_exchange = "messages"
    amqp_queue = ""
    amqp_key = "metrics"
    amqp_durable = false
    amqp_exclusive = true

    ## Instrumentation ##
    [instrumentation]
    # in addition to serving internal metrics via expvar, you can send them to graphite/carbon
    # IMPORTANT: setting this to "" will disable flushing, and metrics will pile up and lead to OOM
    # see https://github.com/graphite-ng/carbon-relay-ng/issues/50
    # so for now you MUST send them somewhere. sorry.
    # (Also, the interval here must correspond to your setting in storage-schemas.conf if you use Grafana Cloud)
    graphite_addr = "graphite-statsd.graphite.svc.cluster.local:2003"
    graphite_interval = 10000  # in ms

For no apparent reason, from time to time, I lose all my tag related information. All gone.

I thought this was related to k8s upgrading hosts (though somehow reinitializing volumes), suspected it was related to a problem with carbon-relay-ng deleting tags when it loses connection with rabbit etc...
But then all other "normal" series are there and working good.
Sorry if this is a noob-ish question but I really explored every possible idea to no avail.
Has anyone here experimented the same before?
Will it be better if I anyhow use a Redis backend?
Thank you so much :)