GetCdHierJson gets hierarchical counter diff of json formatParams: - cd: flat counter diffReturns: - []byte: json formated byte - error: error msg.

GetSdHierJson gets hierarchical StataData of json format Params: - sd: flat state data Returns: - []byte: json formated byte - error: error msg.

KeyGen generate and escape key for key-value output Params: - key: the original key - keyPrefix: e.g., "mod_header" - programName: e.g., "bfe" - withProgramName: whether program name should be included in the result Returns: final key, e.g., "mod_header_ERR_PB_SEEK", "bfe.mod_header_ERR_PB_SEEK"(with programName).

NewCounters creates new Counters.

NewFloatCounters creates new Counters for float64.

NextInterval calculates seconds left for next interval Params: - now: current time - interval: in seconds Returns: seconds left for next interval .

diff of two counters */.

State is state with mutex protect.

StateData holds state data.

Counters holds counters for given key.

FloatCounters is flat counters for float64.