feat(server): replace cache library with Aedile (#1835)

In order to have a better monitoring of our cache, a library that easily
 exposes metrics is a requirement.

This commit replaces the current cache implementation with Aedile, a
wrapper to Caffeine.

Caffeine supports monitoring natively, while aedile allows us to access
it without losing the kotlin-like style.

jit-binding-server/build.gradle.kts

@@ -18,8 +18,8 @@ dependencies {
     implementation("io.ktor:ktor-server-call-id")
     implementation("io.ktor:ktor-server-metrics-micrometer")
     implementation("io.micrometer:micrometer-registry-prometheus:1.14.4")
-    
-    implementation("io.github.reactivecircus.cache4k:cache4k:0.14.0")
+
+    implementation("com.sksamuel.aedile:aedile-core:2.0.3")
     implementation("io.github.oshai:kotlin-logging:7.0.4")
     implementation(platform("org.apache.logging.log4j:log4j-bom:2.24.3"))
     implementation("org.apache.logging.log4j:log4j-jul")

jit-binding-server/src/main/kotlin/io/github/typesafegithub/workflows/jitbindingserver/ArtifactRoutes.kt

@@ -1,7 +1,9 @@
 package io.github.typesafegithub.workflows.jitbindingserver
 
+import com.github.benmanes.caffeine.cache.Caffeine
+import com.sksamuel.aedile.core.asCache
+import com.sksamuel.aedile.core.expireAfterWrite
 import io.github.oshai.kotlinlogging.KotlinLogging.logger
-import io.github.reactivecircus.cache4k.Cache
 import io.github.typesafegithub.workflows.actionbindinggenerator.domain.ActionCoords
 import io.github.typesafegithub.workflows.actionbindinggenerator.domain.prettyPrint
 import io.github.typesafegithub.workflows.mavenbinding.Artifact
@@ -20,16 +22,24 @@ import io.ktor.server.routing.get
 import io.ktor.server.routing.head
 import io.ktor.server.routing.route
 import io.micrometer.core.instrument.Tag
+import io.micrometer.core.instrument.binder.cache.CaffeineCacheMetrics
 import io.micrometer.prometheusmetrics.PrometheusMeterRegistry
 import kotlin.time.Duration.Companion.hours
 
 private val logger = logger { }
 
 typealias ArtifactResult = Result<Map<String, Artifact>>
 
-private val bindingsCache = Cache.Builder<ActionCoords, ArtifactResult>().expireAfterWrite(1.hours).build()
+private val bindingsCache =
+    Caffeine
+        .newBuilder()
+        .expireAfterWrite(1.hours)
+        .recordStats()
+        .asCache<ActionCoords, ArtifactResult>()
 
 fun Routing.artifactRoutes(prometheusRegistry: PrometheusMeterRegistry) {
+    CaffeineCacheMetrics.monitor(prometheusRegistry, bindingsCache.underlying(), "bindings_cache")
+
     route("{owner}/{name}/{version}/{file}") {
         artifact(prometheusRegistry, refresh = false)
     }