Expected behavior:

Serialized metric names shouldn't contain = in their names.

Actual behavior:

Whenever carbon2 serializer is used and metric with = in their name are being serialized then the serializer doesn't translate the = characters, just copies them as is.

Additional info:

Metrics with = in their names may confuse many systems that ingest them.

Suggestion

Replace all = in metric name (and perhaps in all fields?) with _.