Changed

• Don't add event listener to process if cluster module is not used.
• fix: set labels for default memory metrics on linux.
• fix: fix DEP0152 deprecation warning in Node.js v16+.
• fix: Set aggregation mode for newer event loop metrics. (Fixes #418)
• Improve performance of/reduce memory allocations in Gauge.

Added

• feat: added zero() to Histogram for setting the metrics for a given label combination to zero
• fix: allow Gauge.inc/dec(0) without defaulting to 1