zwoop commented on issue #11349:
URL:
https://github.com/apache/trafficserver/issues/11349#issuecomment-2121360353
The common use case, using these APIs rather than the old APIs in ts.h
(which also uses the new Metrics under the hood) would be
```
auto id1 = ts::Metrics::Counter::create(name);
auto id2 = ts::Metrics::Gauge::create(name);
```
If you want the pointer, you can get it from the id, e.g.
```
auto ptr1 = ts::Metrics::Counter::lookup(id1, nullptr);
auto ptr2 = ts::Metrics::Gauge::lookup(id2, nullptr);
```
or, you can also create them directly with createPtr() as above, e.g.
```
auto ptr1 = ts::Metrics::Counter::createPtr(name);
auto ptr2 = ts::Metrics::Gauge::createPtr(name);
```
Note that the lookup() functionalities requires locking around the lookup
tables etc., so are not a good idea to do in critical code. The ID can be used
to access the metric directly though, without locks, such as
```
static auto &instance = ts::Metrics::instance();
instance[id1].increment();
instance[id2].decrement(5);
```
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