feat(jvm): add robust JVM sizing filters and apply across Confluence/Jira

Introduce filter_plugins/jvm_filters.py with jvm_max_mb/jvm_min_mb. Derive Xmx/Xms from docker mem_limit/mem_reservation using safe rules: Xmx=min(70% limit, limit-1024MB, 12288MB), floored at 1024MB; Xms=min(Xmx/2, reservation, Xmx), floored at 512MB. Parse human-readable sizes (k/m/g/t) with binary units.

Wire filters into roles: set JVM_MINIMUM_MEMORY/JVM_MAXIMUM_MEMORY via filters; stop relying on host RAM. Keep env templates simple and stable.

Add unit tests under tests/unit/filter_plugins/test_jvm_filters.py covering typical sizes, floors, caps, invalid inputs, and entity-name derivation.

Ref: https://chatgpt.com/share/68d3b9f6-8d18-800f-aa8d-8a743ddf164d

filter_plugins/jvm_filters.py

@@ -0,0 +1,77 @@
+from __future__ import annotations
+
+import sys, os, re
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
+
+from ansible.errors import AnsibleFilterError
+from module_utils.config_utils import get_app_conf
+from module_utils.entity_name_utils import get_entity_name
+
+_UNIT_RE = re.compile(r'^\s*(\d+(?:\.\d+)?)\s*([kKmMgGtT]?[bB]?)?\s*$')
+_FACTORS = {
+    '': 1, 'b': 1,
+    'k': 1024, 'kb': 1024,
+    'm': 1024**2, 'mb': 1024**2,
+    'g': 1024**3, 'gb': 1024**3,
+    't': 1024**4, 'tb': 1024**4,
+}
+
+def _to_bytes(v: str) -> int:
+    if v is None:
+        raise AnsibleFilterError("jvm_filters: size value is None")
+    s = str(v).strip()
+    m = _UNIT_RE.match(s)
+    if not m:
+        raise AnsibleFilterError(f"jvm_filters: invalid size '{v}'")
+    num, unit = m.group(1), (m.group(2) or '').lower()
+    try:
+        val = float(num)
+    except ValueError as e:
+        raise AnsibleFilterError(f"jvm_filters: invalid numeric size '{v}'") from e
+    factor = _FACTORS.get(unit)
+    if factor is None:
+        raise AnsibleFilterError(f"jvm_filters: unknown unit in '{v}'")
+    return int(val * factor)
+
+def _to_mb(v: str) -> int:
+    return max(0, _to_bytes(v) // (1024 * 1024))
+
+def _svc(app_id: str) -> str:
+    return get_entity_name(app_id)
+
+def _mem_limit_mb(apps: dict, app_id: str) -> int:
+    svc = _svc(app_id)
+    raw = get_app_conf(apps, app_id, f"docker.services.{svc}.mem_limit")
+    mb = _to_mb(raw)
+    if mb <= 0:
+        raise AnsibleFilterError(f"jvm_filters: mem_limit for '{svc}' must be > 0 MB (got '{raw}')")
+    return mb
+
+def _mem_res_mb(apps: dict, app_id: str) -> int:
+    svc = _svc(app_id)
+    raw = get_app_conf(apps, app_id, f"docker.services.{svc}.mem_reservation")
+    mb = _to_mb(raw)
+    if mb <= 0:
+        raise AnsibleFilterError(f"jvm_filters: mem_reservation for '{svc}' must be > 0 MB (got '{raw}')")
+    return mb
+
+def jvm_max_mb(apps: dict, app_id: str) -> int:
+    """Xmx = min( floor(0.7*limit), limit-1024, 12288 ) with floor at 1024 MB."""
+    limit_mb = _mem_limit_mb(apps, app_id)
+    c1 = (limit_mb * 7) // 10
+    c2 = max(0, limit_mb - 1024)
+    c3 = 12288
+    return max(1024, min(c1, c2, c3))
+
+def jvm_min_mb(apps: dict, app_id: str) -> int:
+    """Xms = min( floor(Xmx/2), mem_reservation, Xmx ) with floor at 512 MB."""
+    xmx = jvm_max_mb(apps, app_id)
+    res = _mem_res_mb(apps, app_id)
+    return max(512, min(xmx // 2, res, xmx))
+
+class FilterModule(object):
+    def filters(self):
+        return {
+            "jvm_max_mb": jvm_max_mb,
+            "jvm_min_mb": jvm_min_mb,
+        }